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The World’s No.1 Sleep Expert: The 6 Sleep Hacks You NEED! Matthew Walker

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The World’s No.1 Sleep Expert: The 6 Sleep Hacks You NEED! Matthew Walker

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3252 segments

0:00

when you're struggling with sleep in the

0:01

middle of the night and you're wide

0:03

awake in the last hour before bed try

0:06

this experiment

0:08

I'm I'm sold Matthew Walker

0:11

neuroscientist and best-selling author

0:13

and one of the world's leading

0:15

researchers in sleep science it's gonna

0:17

blow your mind there's a global sleep

0:19

loss epidemic shaped by this thing

0:22

called the modern world what Society

0:24

wants is that you're either producing or

0:26

you're consuming in fact the CEO of

0:28

Netflix his statement was that we are to

0:31

commit war against sleep we have this

0:33

mentality in business less sleep equals

0:36

more productivity that is just not true

0:38

insufficient sleep costs most Nations

0:41

about 411 billion dollars

0:44

your rates of obesity cardiovascular

0:47

disease mental health conditions all of

0:49

these things escalate if that wasn't bad

0:51

enough oh my God if you're not getting

0:53

sufficient sleep then 60 of all of the

0:57

weight that you lose will come from lean

1:00

muscle mass and not fat not the muscle

1:03

how would you redesign Society to help

1:07

us to sleep better so first I would

1:09

feels like caffeine is a miracle drive

1:12

with no apparent cost was I wrong or was

1:15

I right wrong caffeine will hurt your

1:18

sleep in three ways most people are not

1:21

aware of so if you have a cup of coffee

1:22

at midday what happens is that

1:28

before we get into this episode just

1:29

wanted to say thank you first and

1:31

foremost for being part of this

1:32

community

1:33

um the team here at the diver CEO is now

1:35

almost 30 people and that's literally

1:37

because you watch and you subscribe and

1:39

you um leave comments and you like the

1:41

videos that this show has been able to

1:43

grow and it's the greatest honor of my

1:45

life to sit here with these incredible

1:46

people and just selfishly ask them

1:48

questions that I'm pondering over or

1:50

worrying about in my life but this is

1:52

just the beginning for the day of this

1:53

year we've got big big plans to scale

1:55

this show and to every corner of the

1:57

world and to to diversify Our Guest

1:59

selection and that's enabled by you by a

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simple thing that you guys do which is

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2:16

let's get on with it

2:19

[Music]

2:26

I have spent the longest time trying to

2:30

sit down with you on this podcast I'm

2:31

very very happy to spend some time with

2:33

you today

2:35

and that is because your your work is

2:37

now world renowned

2:39

um and it's a very very important work

2:41

but

2:43

as is the case with a few of the recent

2:45

episodes in this podcast I wanted to

2:46

start by asking you

2:48

in your view

2:50

what is it you do and why is it so

2:53

important in your mind that you do it

2:56

well firstly thank you so much for

2:58

having me here and having this

3:00

conversation it's an incredible

3:02

privilege to sit with you

3:04

um why do I do what I do and why do I

3:08

think it's important

3:10

um sleep I would argue is the single

3:14

most effective thing that you can do to

3:16

reset your brain and body health

3:18

and I don't say that flippantly it's not

3:21

as though I'm dismissing exercise or

3:23

Diet those two things are absolutely

3:25

critical but if I were to take you the

3:28

individual and deprive you of exercise

3:31

for a day deprive you of food for a day

3:34

deprived you of water for a day or

3:37

deprive you of sleep for a day 24 hours

3:40

and I were to map your brain and body

3:42

impairments it's not even a competition

3:44

that one night of lost sleep relative to

3:48

those other things it dwarfs the only

3:50

thing I lose out against is oxygen if I

3:53

deprive you oxygen you're going to Puff

3:55

out of existence a little bit quicker

3:57

than you will with a lack of sleep so

4:00

sleep to me I think is the elixir of

4:04

life it is your life support system and

4:07

as best we can tell I would argue it's

4:10

Mother Nature's Best effort yet at

4:12

immortality

4:13

and so in that regard that's why I when

4:16

I look across all of the studies and all

4:18

of the data it's so compelling to me and

4:22

part of the reason I think it's I've

4:25

desperately tried and I haven't done a

4:27

good job but I've tried to offer some

4:29

public mission of reuniting Humanity

4:32

with the sleep that it's so bereft of is

4:35

because it does appear that there is a

4:36

global sleep loss epidemic if you look

4:38

at the numbers people are struggling so

4:41

desperately with their sleep so we have

4:44

all of this knowledge this incredible

4:45

knowledge of sleep and how important it

4:47

is and it's a perfect storm colliding

4:50

with this great sleep depression in

4:53

modern society and for that reason I

4:56

just felt as though what can I do to try

4:58

to help offer this voice and this

5:01

science and I am but a scientist and I

5:04

stand on the shoulders of all of my

5:06

colleagues and all of these Giants in

5:08

the field I'm just a researcher so

5:10

that's a little bit about I guess who I

5:12

am but more about why I do it and why I

5:15

think it's important if I were to try

5:17

and Define your sort of unless I hate

5:18

doing this because it requires the

5:20

application of some kind of narrow label

5:22

if I was to try and Define what your

5:24

title is in your own words what would

5:26

that be so I'm just a professor of

5:29

Neuroscience of brain science at the

5:31

University of California Berkeley

5:34

um I am I am not a medical doctor just

5:36

FYI for all of the things that we will

5:38

talk about in this conversation so I'm

5:40

just a PhD

5:42

just a PhD yeah you know that's um

5:45

incredibly humble of you but but I would

5:47

assert that you're without a shadow of a

5:49

doubt the leading

5:52

author scientist commentator voice as it

5:57

relates to the topic of sleep

5:59

and my my question from that is where

6:02

did that begin like where did that start

6:05

in your life in the Journey of your life

6:07

when did sleep become the thing

6:11

it occurred to me or happened to me I

6:14

should say when I was doing my PhD I was

6:17

studying people with dementia and we

6:20

were trying to understand what type of

6:22

different dementia that they had very

6:24

early on in the course of their disease

6:26

and we were looking at patterns of

6:29

brainwave activity so I was placing

6:31

electrodes all over the head and I was

6:32

measuring them and I was trying to

6:34

differentially diagnose them very early

6:36

on and I was getting no good data

6:39

whatsoever it's miserable nothing was

6:41

was Landing

6:43

and one day I went home at the weekend

6:46

and sort of with all of my printed

6:48

journals and I go to the my doctor's

6:50

residence and have this sort of igloo of

6:52

journals around me that I would sit and

6:54

read at the weekend

6:56

um and I was which probably tells you

6:57

everything about my social life at the

6:59

weekend if that's what I was doing but

7:01

um so I was reading these journals and

7:03

it occurred to me that some of these

7:05

dementias were eating away at the Sleep

7:07

Centers in the brain and others would

7:10

leave them untouched and at that moment

7:12

I realized I'm measuring my patience at

7:14

the wrong time I'm measuring them when

7:16

they're awake should be measuring them

7:19

when they're asleep

7:20

started doing that got amazing results

7:23

and at that point I wanted to ask the

7:26

question well I wonder if the Sleep

7:28

problems are not simply a symptom of the

7:31

dementia

7:32

I wonder if it's a potential cause of

7:35

the dementia

7:36

and at that point I started to think

7:38

well so then what is this thing called

7:41

sleep

7:42

and what I learned is that some of the

7:45

greatest Minds in the past 100 years had

7:49

tried to answer a very simple question

7:50

why do we sleep

7:53

and you know 30 years ago in fact the

7:57

crass answer was that we sleep to cure

8:00

sleepiness

8:01

which tells you nothing about you know

8:03

it's like saying I eat to cure hunger

8:05

well no you that's not the right answer

8:09

now 30 years later we've had to upend

8:12

the question and we now have to ask is

8:15

there any physiological system in your

8:17

body is there any operation of your mind

8:20

that isn't wonderfully enhanced when you

8:22

get sleep or demonstrably impaired when

8:25

you don't get enough and the answer

8:27

seems to be to be nother so my journey

8:30

into the science of sleep really was an

8:33

accident but at that moment in time when

8:36

I started reading about sleep I utterly

8:39

fell in love with the topic

8:41

and it is a love affair that has lasted

8:44

me over 20 years

8:46

I think it is the most beguiling Topic

8:48

in all of science I'm biased of course

8:52

and I will never study anything

8:54

different I know that now I'll study it

8:56

to the end of my career and until the

8:58

end of my life

9:00

wow

9:01

I've never heard anybody say to me on

9:03

this podcast that they would study

9:05

the same topic for the rest of their

9:07

life and you're a young man that's a

9:09

you've got a long way to go actually the

9:11

amount you've been sleeping it's very

9:12

kind of you to say yeah I I wish I'm

9:14

moving into the foothills of middle age

9:16

rapidly but no I I'm so fortunate in

9:21

what I do

9:22

um to have found it or for it to have

9:24

found me you know if I won all of the

9:27

money in the world tomorrow

9:30

I would genuinely genuinely not do

9:33

anything different

9:36

um I I am so fortunate well I probably

9:39

start trying to fly like business class

9:41

or first class that would be nice but

9:42

other than that

9:44

um I would do nothing different and I

9:46

I'm very mindful of that because that

9:48

sounds very privileged and I know a lot

9:50

of people

9:53

endure what they do for a living rather

9:56

than enjoy what they do for a living

9:59

and I know how lucky I am so I don't

10:02

mean to be dismissive of of people in

10:04

that regard I just know how much I love

10:06

what I do you you asked a question now

10:08

which is

10:09

um you you posed a question which many

10:11

people have tried to answer you gave the

10:12

the answer from 30 years ago about you

10:15

know why do we sleep

10:17

um and it dawned on me as you said that

10:19

that I've never asked myself that

10:21

question

10:22

I've never even pondered the thought of

10:24

why I sleep I mean I know what happens

10:26

when I sleep but do I know why my body

10:29

can't just find another way why can't my

10:31

body stay awake for the 24 hours I know

10:33

some animals they sleep half their brain

10:34

and then the other half kind of it

10:36

doesn't happen whatever why why why do

10:39

we sleep

10:40

it's a puzzling question because when

10:42

you think about it from an evolutionary

10:44

perspective it makes no sense whatsoever

10:48

sleep is utterly

10:51

idiotic because when you're sleeping

10:54

firstly you're not finding a mate you're

10:56

not reproducing you're not foraging for

10:59

food you're not caring for your young

11:01

and worst of all You're vulnerable to

11:04

predation now on any one of those

11:08

grounds but especially all of them as a

11:10

collective sleep should have been

11:12

strongly selected against during the

11:14

course of evolution

11:16

but from best we can tell sleep evolved

11:19

with life itself on this planet and it

11:23

has fought its way through heroically

11:25

every step along the evolutionary path

11:29

and what that has told us is that sleep

11:31

must be essential at the most basic of

11:34

biological levels and now we understand

11:37

that mother nature didn't make a

11:40

spectacular blunder with this thing

11:42

called sleep sleep for example will

11:44

restock the Weaponry in your immune

11:48

Arsenal and it will make you a more

11:50

immune sensitive individual so your more

11:52

immune robust when you wake up

11:55

we also know that it regulates your

11:58

blood sugar levels it controls your

12:00

appetite hormones it also regulates your

12:02

sex hormones testosterone estrogen sleep

12:06

upstairs within the brain will fixate

12:09

memories and help you learn and remember

12:11

sleep will de-escalate anxiety it will

12:15

reduce your emotional difficulties and

12:17

traumas sleep will actually cleanse away

12:21

the Alzheimer's toxic proteins that

12:24

build up in the brain you know the list

12:26

is endless these are all of the reasons

12:29

that we need to sleep

12:31

but why can't I just do what those

12:34

animals do where they half their brain

12:36

falls asleep after the brain stays awake

12:38

is that at all linked to the fact that

12:39

we we live in tribes so we are

12:41

essentially although we're you know

12:43

there might be 10 people in the tribe

12:44

where

12:45

all 10 of the tribe so we can rest at

12:48

different times and kind of cover each

12:50

other's backs or

12:51

gosh yeah so actually there are two

12:54

nested very insightful questions there

12:57

the first is this notion of what you're

12:59

describing which is what we call uni

13:01

hemispheric sleep which is just a fancy

13:04

way of saying you can sleep with one

13:05

half of your brain and the other half is

13:07

wide awake now there are only a few

13:09

species that can do this

13:12

um for example aquatic mammals dolphins

13:14

are a great example we can place

13:17

actually electrodes on their heads and

13:20

you can see that one half of their brain

13:22

will be fast asleep it will be in deep

13:25

deep non-rem sleep the other half of the

13:27

brain will be frenetic wide awake and in

13:31

part for them the reason is because they

13:33

need to maintain aquatic Mobility you

13:36

know they need to keep surfacing for ER

13:38

otherwise you know that's not going to

13:40

be a good outcome we also know that uh

13:44

birds or even many avian species will

13:47

have uni hemispheric sleep and you can

13:50

actually see this there's some great

13:51

YouTube videos online where they will

13:54

film one half of the sort of the side of

13:57

the The Bird's face and the eye is

13:59

closed and what it means is that the

14:02

other half of the brain because the

14:03

brain is actually the left half controls

14:05

the right side the right side controls

14:06

the left side so that left side is now

14:09

fast asleep which is the right eye

14:10

closed and then you kind of pan around

14:13

and all of a sudden the other eye is

14:15

wide awake and it's clearly looking

14:17

about now this is obviously not for

14:19

aquatic surfacing to gain air this is

14:21

for a different reason what happens is

14:23

that in a flock a bunch of birds will

14:27

all land on a branch

14:29

now all of the folks in the middle they

14:32

get to sleep with both halves of their

14:34

brain they can sleep with both halves or

14:36

just one half all of the folks in the

14:38

middle they get to sleep with both

14:39

halves the unfortunate girl or guy who

14:42

sort of lands at the end to the far end

14:46

they will actually sleep with one half

14:48

of their brain so one half of the flock

14:51

the entire flock has one eye 180 degrees

14:54

of sort of half panoramic view

14:57

out the other bird on the other end will

15:01

have the other half of the brain asleep

15:03

with the other eye awake giving the

15:05

other 180 degree view of protection

15:09

vision and therefore the entire tribe

15:12

has a 360 degree assessment now you

15:16

would think in furnace that once those

15:19

guys or girls at the end have done their

15:21

Duty they get to move into the middle

15:23

and they get to sleep with both halves

15:25

no that's not what happens what they

15:27

will do after a while is that they will

15:29

stand up they will turn around 180

15:32

degrees sit back down and switch the

15:35

other sides of the brain

15:37

so to to just be clear the complexity of

15:43

wiring and architecture that has to

15:45

happen for one half of the brain to be

15:48

deep in sleep and the other half to be

15:50

wide awake is astronomically hot I mean

15:54

it's incredibly difficult to create that

15:56

wiring what that tells me is that if

15:59

sleep was dispensable if it was

16:01

negotiable then mother nature would have

16:04

just found a different way for us to get

16:06

all of these brain and body benefits and

16:08

not gone to all of the evolutionary

16:10

trouble of figuring out this fancy

16:13

wiring for half brain sleep in other

16:15

words you just can't get away from sleep

16:18

you have to sleep but your second

16:21

question I think is is even more

16:23

fascinating which is us as a tribe

16:25

because we are a tribe species

16:29

now there is something else that we call

16:31

your chronotype are you a morning type

16:34

evening type or somewhere in between

16:37

and by the way you don't get to decide

16:39

it's not your choice you know this

16:41

notion of these go-getter type A's who

16:44

say everyone has to be awake at five in

16:46

the morning you know you go to the gym

16:49

you blast out a workout for an hour and

16:51

you're at the desk by 6am

16:54

um you have no choice if you're an

16:57

evening type you're an evening type it's

16:58

hard-coded we know that right now

17:00

there's at least 22 different genes that

17:02

dictate what you are morning type

17:04

evening type or somewhere in between and

17:06

it's about third third split across the

17:08

population why is it a split why are we

17:12

nicely spread out across our chronotypes

17:15

for exactly the reason you described

17:17

because when we're in a tribe if we all

17:20

sleep at the same time we're all

17:21

vulnerable for eight hours

17:23

but if you were to insert some genetic

17:26

variability into when people have a

17:29

desire to sleep you've got the morning

17:31

types who maybe go to bed at 9 00 pm and

17:34

are waking up let's say at 5 00 am and

17:37

then you've got all of the extreme

17:39

evening types who are going to bed at

17:41

2AM and waking up at maybe 11 or midday

17:45

so that way the everyone gets their

17:48

eight hours of sleep but the entire

17:51

tribe the nucleus of this group of homo

17:53

sapiens themselves is only vulnerable

17:56

for maybe just two or three hours so

17:59

it's a clever solution that Mother

18:02

Nature has come up with to say everyone

18:04

gets there eight hours but as a species

18:06

you're only going to be vulnerable for

18:08

two to three hours max when everyone at

18:11

least as a collective is sleeping

18:13

absolute genius I used to think it was a

18:15

load of nonsense that this Chrono type

18:17

thing um it was actually on this podcast

18:18

where I learned about its existence and

18:20

then I went on YouTube to learn more and

18:22

your video came up if you're explaining

18:24

it because I thought I was pondered by

18:26

my partner goes to bed super early wakes

18:30

up super early I go to bed late wake up

18:33

late

18:34

um

18:35

I'm gonna ask you this question actually

18:36

because because I've wondered this in

18:38

that situation where I'm sleeping in bed

18:39

with a partner that has a different

18:40

chronotype yeah

18:43

it can have an impact on my sleep right

18:46

because of the way that our sleep cycles

18:47

work and the REM sleep in the stage one

18:49

deep sleep etc etc if she's waking up

18:51

when I'm pulling into REM sleep I she's

18:54

waking up at 5am but at 5am because I've

18:56

gone to bed later my REM sleep has just

18:58

begun that has quite a significant

19:00

impact on me right

19:02

if she is waking you up yeah she's

19:05

waiting if she wakes me up then it's

19:06

non-trivial and likewise if you're

19:08

waking her up as you're getting into bed

19:10

on the front end of sleep

19:13

so it's very difficult one of the things

19:15

that couples will cite if they break up

19:18

firstly is usually about a third of them

19:22

will cite sleep difficulties or sleep

19:24

issues really as a as a cause of their

19:27

their breakup or at least as a

19:29

contributing factor to that breakup

19:31

one-third yeah that it's one of at least

19:34

one of the factors when you go it then

19:36

in and when you double click to say okay

19:38

then what it is about this sleep kind of

19:41

tension between the two of you one of

19:44

those things is a mismatch in chronotype

19:48

and you can see this when you know

19:50

people I think this you know on dating

19:52

profiles now someone was telling me

19:53

people will even say like I'm a morning

19:55

type or I'm an evening type as if you're

19:58

stating up front this is part of my

20:00

identity and just FYI be forewarned

20:02

because maybe it's been an issue for

20:04

them in the past

20:05

this is why I often speak about the

20:09

notion of what's called a sleep divorce

20:12

to prevent a real one now it's not for

20:16

everyone um a sleep divorce is where you

20:18

sleep in separate locations

20:20

and when we've surveyed people

20:23

um both uh use it in the from the Sleep

20:25

Council in the United Kingdom and also

20:27

in the National sleep Foundation here in

20:29

America the data is about the same one

20:32

in four people will say that they sleep

20:34

in different locations with their

20:36

partner so almost a quarter of people in

20:40

relationships will sleep in different

20:42

locations we think it's potentially an

20:45

underestimate because if you survey

20:47

people anonymously

20:49

then a third of them will report waking

20:52

up at least in a different location the

20:55

next morning

20:57

and part of the reason that it's a taboo

21:00

is because people think well if I'm if

21:02

we're not sleeping together then we're

21:04

not sleeping together the exact opposite

21:07

is true that when a couple is sleeping

21:09

well

21:11

we know that the sex hormones are

21:13

improved testosterone men estrogen and

21:17

uh at least an icing hormone in women we

21:20

also know that your

21:23

um desire to be intimate with your

21:25

partner is increased what we found is

21:27

that for an hour of extra sleep if a

21:30

woman gets an hour of extra sleep her

21:33

libido desire to be intimate with her

21:35

partner increases by 14 percent

21:38

now to give you some context the FDA

21:42

drugs for improving or increasing libido

21:44

in women drugs such as violisi here

21:47

clinical drugs they will increase it by

21:49

about 24 and that's a pharmacological

21:52

agent but here just the added

21:54

non-pharmacological benefit of one hour

21:57

of extra sleep will get you more than 50

21:58

percent of the way there

22:01

so I want to just remove that notion of

22:04

the stigma

22:05

of that if you're not sleeping together

22:08

you're not sleep it's usually quite

22:10

quite the opposite

22:13

um I would say that

22:15

part of the the challenge though is

22:19

that

22:21

if we look at all objective measures if

22:23

I measure your sleep and the sleep of

22:26

your wife

22:27

if when you're sleeping separately

22:29

versus when you're sleeping together

22:30

it's very likely that objectively you

22:33

will both be sleeping worse when you're

22:35

sleeping together that's what the

22:37

science tells us however what's

22:39

interesting is that when you survey

22:41

people and say how satisfied are you

22:44

with your sleep which is a subjective

22:46

measure people will say I'm actually

22:49

more satisfied with my sleep when I'm

22:51

with my partner than when I'm sleeping

22:54

alone so there's a mismatch here

22:56

objectively your sleep is better but

22:58

subjectively you still prefer that and

23:01

of course it's natural you know we there

23:03

is safety there's Security in

23:05

co-sleeping there is this

23:08

sort of connection that we get you you

23:12

can approach it if you want just be

23:14

honest with yourself

23:15

and be honest with your partner

23:17

and you can start by saying look this

23:20

isn't forever

23:22

I just want to say Let's do an

23:24

experiment for a week

23:26

10 days let's let's just try it and see

23:29

how it goes it doesn't need to be

23:31

permanent because what you actually miss

23:34

are the book ends of sleep

23:36

for the most part the two of you are not

23:38

conscious for most of the experience of

23:40

sleeping together

23:41

it's really getting into bed instead of

23:44

having a kiss or a cuddle or and sort of

23:46

waking up together in the morning and

23:47

sort of now obviously when you're a

23:49

mismatched chronotype that's also it can

23:51

be a challenge too so you can still have

23:54

a sleep divorce but you can set up a

23:57

system where you will go in and you'll

23:59

say your good nights and you'll kind of

24:01

get into bed have a kiss and cuddle and

24:02

then you Retreat to a separate location

24:04

and you can repeat that same process so

24:08

I I don't want to sort of believe at the

24:12

point of a of a sleep divorce but um

24:14

people can certainly explore there is

24:16

something called a halfway house which

24:18

is called the Scandinavian method which

24:21

sounds far more salacious than it

24:23

actually is it's simply that you buy two

24:25

beds and you put them side by side in

24:28

the same room and therefore the amount

24:30

of disruption physical

24:33

um disruption that happens by way of

24:34

sheets and movement is decreased but

24:37

that doesn't solve it all sometimes

24:39

there is snoring uh sometimes there is

24:41

sleep talking those things are not

24:43

obviated by the Scandinavian method

24:46

when you think about where Society is I

24:48

was I was going to ask you you know you

24:50

said you wanted to to do the work you're

24:51

doing now for the rest of your life

24:53

um so do you think the work you're doing

24:55

now is going to become increasingly more

24:57

important and relevant

25:00

I.E is the problem gonna get worse or is

25:03

it going to become less significant and

25:05

less relevant based on the trajectory of

25:07

societies you see it

25:10

you know I'm

25:11

mixed I think when I wrote the book I

25:14

started writing uh

25:17

a book that was called why we sleep back

25:20

in probably about 2014 or 15 and at that

25:23

point sleep was the neglected stepsister

25:25

in the health conversation of that day

25:27

you know we were speaking a lot about

25:29

diet and exercise which was wonderful

25:31

but there was no voice of sleep

25:34

and I was so sad about that because I

25:37

could see so much disease and suffering

25:39

that was coming so clearly by way of a

25:41

lack of sleep but it wasn't there on the

25:45

public buffet menu for consumption of

25:48

knowledge and so that was part of the

25:51

motivation for trying to write the book

25:54

so I would say now

25:56

and this is not because of me or the

25:58

book or anything like that but is is

26:00

sleep more of a conversation in this day

26:03

and age than it was six or seven years

26:06

ago I think I would say yes there is a

26:09

greater awareness of of sleep

26:13

um

26:14

but with that awareness

26:19

I want I think one can still question

26:21

the pragmatics meaning

26:24

just because we're talking about it more

26:26

does not mean that people are still

26:29

failing to either get the sleep that

26:32

they need or that they are unable to get

26:36

the sleep that they need and those two

26:37

things are different one is that you are

26:39

healthy and you can generate the sleep

26:41

that you need but you don't give

26:42

yourself the opportunity time or life I

26:45

should say sometimes because it's

26:46

sometimes not your choice life does not

26:48

give you the chance to get sleep and if

26:50

only you had the chance you could sleep

26:52

that's one version the second version is

26:54

no I'm giving myself the right

26:56

opportunity to sleep but because I'm

26:58

anxious or because of other issues I am

27:01

not able to generate sleep I suffer from

27:03

insomnia and sleep problems

27:05

so those two things I don't see having

27:09

changed since you know I think this

27:13

public movement this increasing movement

27:15

of sleep conversation came on the table

27:18

so in that regard I'm more pessimistic

27:21

than I am optimistic and I think it will

27:24

only get worse if you look at rates of

27:26

insomnia for example they're only

27:28

increasing they're only escalating rates

27:31

of anxiety disorders the very same thing

27:33

and those two things are intimately

27:35

intertwined

27:37

so I think

27:39

I wish I my mission was extinguished

27:42

within the next couple of years because

27:44

Society started sleeping wonderfully

27:46

well I don't think that's going to be

27:48

the case so I think I've got my work cut

27:50

out for me

27:52

um to try and help people with better

27:54

sleep

27:55

um is it so it's getting we're getting

27:57

worse at sleeping

27:59

I think

28:00

modernity is making it so much more

28:05

difficult for us to sleep modernity I

28:08

think when you think about

28:11

we often think about sleep as a

28:13

biological process and it very much is

28:15

and but

28:17

also it's so environmental as well as

28:21

biological meaning

28:24

when you were to say you know how did

28:26

you sleep last night think about all of

28:28

the external factors that changed it

28:31

well I had to be up at this time I had

28:33

to catch a flight this time my partner

28:35

went to bed at this time and she woke up

28:37

at this time there was this noise that

28:39

sort of happened I'm now sleeping in a

28:41

hotel room you know there are countless

28:44

externalities and those externalities

28:47

are shaped by this thing called the

28:49

modern world and in the modern world if

28:52

I could really be cynical and I'm not

28:54

someone I'm very optimistic and I'm very

28:56

non-cynical but you could argue from a

28:58

capitalistic standpoint that Society

29:01

does not want you sleeping because what

29:04

Society wants from a capitalistic point

29:06

of view is that you're either producing

29:08

or you're consuming

29:10

and when you're sleeping you're neither

29:12

producing and you're neither consuming

29:15

and so

29:16

there are lots of ways that I think

29:19

society and the modern world has

29:22

conspired willfully or not

29:25

conspiratorially or not to

29:31

decrease and try to diminish sleep in

29:34

fact I think the CEO of Netflix several

29:37

years ago and I'm sure that YouTube

29:39

comments will correct me if I'm wrong

29:40

here but I believe his very statement

29:42

was that we are

29:44

we are deciding to commit war against

29:47

sleep

29:48

that was their goal

29:50

and it just stunned me that you know

29:53

that we're going to go to war with sleep

29:55

we're going to remove you from your

29:57

sleep so there are lots of ways in in

29:59

which I think Society does not help us

30:02

light is another good example we are a

30:04

dark deprived Society in this modern era

30:07

because we're exposed to light we are

30:10

not giving ourselves the right

30:12

temperature cues you know we go into an

30:14

office where it's you know 20 degrees at

30:17

70 degrees Celsius whatever it is stock

30:19

stable then we come home and we regulate

30:22

our temperature at home to be the same

30:24

thing

30:25

we take on board probably too much

30:27

caffeine in this day and age although I

30:30

am actually an advocate of drinking

30:32

coffee and I can explain why too but

30:34

anxiety as I said is a huge issue all of

30:39

these things are preventing and classic

30:41

roadblocks to sleep

30:45

any of us are getting the sort of

30:47

recommended daily allowance of sleep as

30:50

a percentage do you know it seems to be

30:52

about

30:54

um one third of most modern

30:57

civilizations are failing to get the

31:00

recommended seven to nine hours of sleep

31:02

a night one third so roughly 30 35 33

31:07

roughly yeah and it does that have

31:09

Geographic variants I in some countries

31:12

it's worse in some countries it's better

31:13

I'm thinking about the UK versus the us

31:14

or you know Japan or whatever yeah it is

31:17

and in fact you let me give numbers to

31:21

the three countries that you've

31:22

described uh here in the United States

31:24

the average amount of sleep that people

31:27

are getting is uh six hours and uh 29

31:32

minutes in the UK it's not much better 6

31:34

hours and 49 minutes Japan was the worst

31:38

six hours and 22 minutes now to be clear

31:44

that's the average what that means is

31:48

that there is still a large proportion

31:50

of that bell-shaped distribution

31:52

of people getting even less than that

31:56

amount now there are some countries that

31:59

you look at

32:00

um that are actually sleeping much

32:02

better than that I think let me um

32:05

Mexico for example is

32:08

um is doing very well if you look at

32:09

Mexico City uh people are actually

32:11

sleeping and not too far off from eight

32:14

hours so there is variability and we can

32:17

try to understand why which by the way

32:19

just brings me back while I think about

32:21

it to your comment of will my work be

32:23

done not from the because I'm a

32:25

scientist and I do I have a run a Big

32:27

Sleep Center at UC Berkeley but the work

32:30

I do as a hopefully a public advocate

32:32

for sleep why I don't think it's going

32:34

to change

32:35

um anytime soon is because

32:38

governments aren't really doing much

32:41

about it and I've tried as best I can

32:43

and if there is any government out there

32:45

that listens to this that wants to work

32:46

with me I'd be delighted

32:49

I don't remember and maybe you can but

32:51

any major first world nation government

32:55

that has had a public health campaign

32:57

regarding sleep

32:59

and it stuns me because those same

33:02

governments have had Public Health

33:04

campaigns regarding you know eating

33:06

regarding smoking regarding drunk

33:09

driving regarding risky behaviors safe

33:12

sex loneliness loneliness Mental Health

33:17

suicide

33:19

where is sleep in that equation

33:23

and it's such a fundamental ingredient

33:26

and in fact almost all of those things

33:28

that I've just described

33:30

have an intimate relationship with sleep

33:33

I mean suicide especially we we're

33:36

starting to do a lot of work with this

33:37

although it's been hard to get funding

33:39

but what we found is that insufficient

33:42

sleep is a precursor to Suicide that

33:45

sleep disruption seems to predict both

33:48

suicide ideation in other words suicidal

33:51

thinking suicide planning and tragically

33:55

suicide completion as well so if we were

33:58

to try to have governments create a

34:01

public health campaign to pull this

34:03

Archimedes lever on better sleep there

34:07

are so many other health benefits you

34:09

know sleep is the tide that rises all

34:12

the other health boats it's almost like

34:14

um

34:15

it's like a mixing deck in a studio you

34:17

know in those sound Studios where you've

34:19

seen it and then there's that one button

34:20

all the way to the end the white button

34:22

sort of that when you move it up instead

34:24

of all of the other dials the sort of

34:26

the red yellow orange green dots they

34:28

all move up at the same time as well

34:30

there's this like sort of one mess

34:31

there's like one ring to rule them all

34:33

which sleep is that Archimedes lever so

34:37

if governments could only execute on

34:39

that the health benefits would be

34:41

manifold in terms of their consequences

34:44

it begs the question you know if I were

34:46

to make you today president prime

34:49

minister whatever of the world and you

34:52

had to do you know just a few things to

34:54

really fix the

34:57

lack of sleep epidemic there you go

35:00

diagnosed it

35:01

um what would those things be if you

35:02

were in charge how would you redesign

35:05

Society to help us to sleep better

35:09

gosh it's such a good question and I've

35:11

thought a lot about this

35:13

it almost in Reverse which is to say why

35:16

is it that we are struggling to get

35:19

sleep and there is no single answer

35:21

there are so many different reasons and

35:24

that's why it's actually a very

35:25

challenging problem to solve

35:27

I would go through a descending level of

35:30

steps so first I would start at the

35:32

government level and we would get those

35:34

Public Health campaigns in order

35:37

next I would go to the professional

35:40

level because there we have this

35:42

mentality in business that you know

35:45

sleep is for the soft Among Us that

35:50

less sleep equals more productivity

35:54

and that is just not true and I can

35:56

provide you with all of the evidence so

35:58

we need to get rid of this sort of sleep

36:00

machismo attitude in the workplace where

36:03

we were where our badge of honor of

36:04

sleep deprivation on our arms we need to

36:07

get companies to actually start

36:09

embracing sleep and I can guarantee you

36:11

and I can give you all of the evidence

36:13

as to why if as a company as a CEO if

36:17

you start prioritizing the sleep of your

36:20

employees you will be far better off as

36:23

a company you will be more product based

36:26

and you will be more profitable and

36:28

revenue generating

36:30

sleep is the very best form of

36:32

physiologically injected Venture Capital

36:34

that you could ever wish for and in fact

36:37

the Rand corporation which is an

36:38

independent survey Corporation what they

36:40

found is that at a national level

36:43

insufficient sleep costs most Nations

36:46

about two percent of their GDP

36:49

so here in America that number was 411

36:51

billion dollars of lost profit caused by

36:54

insufficient sleep in the United Kingdom

36:56

it was over 50 billion dollars in Japan

36:59

it was over 120 billion dollars if I

37:01

could solve the Sleep loss crisis in the

37:04

workplace I could perhaps double the

37:06

healthcare benefit for many of those

37:08

countries or I could halve the out the

37:10

education deficit in those countries so

37:12

the next level I would Target is at

37:15

business then next step down would be

37:17

medicine

37:18

medicine is a classic demonstration here

37:21

we have Junior doctors or here in

37:23

America they have doctor residency

37:25

programs where people are working 20 30

37:28

hour shifts

37:30

and so already doctors are inculcated

37:33

into the mindset of the uselessness of

37:37

of sufficient sleep

37:39

across numerous countries and I think it

37:42

was maybe over eight different countries

37:44

we looked at the medical curricula and

37:46

we asked how many hours of education do

37:48

doctors get about sleep

37:50

and what's strange is that you know

37:52

often doctors you'll go in and you'll

37:54

have an appointment they'll say okay you

37:55

know how are you eating and you know

37:57

what's going on with the bathroom how's

37:58

the toilet and then you know how are you

38:01

sleeping as if sleep is one of these

38:03

Universal Health barometers but what we

38:05

found is that most doctors will only be

38:07

given about an hour to an hour and a

38:10

half of sleep education during their

38:12

entire medical school education which

38:16

blows my mind because it is one third of

38:19

the patients lives but they're only

38:22

given about 90 minutes of education so

38:25

no wonder your doctors aren't treating

38:27

your sleep problems thinking about your

38:30

sleep problems understanding yourself

38:31

it's not their fault and plus they're

38:34

sleep deprived anyway when they're being

38:35

trained ironically by the way

38:39

doctors Junior doctors who've worked a

38:42

30-hour shift when they finish that

38:44

30-hour shift and get back in their car

38:46

they are 168 more likely to get into a

38:50

car accident because of their lack of

38:52

sleep and and back up in the emergency

38:54

room from where they were just working

38:56

but now as a patient I mean this the

39:00

Paradox the irony just stuns me so I

39:03

next move down to the level of medicine

39:05

then I would go to education because we

39:09

don't get taught about sleep in schools

39:11

and I never got one of those special

39:13

classes you know I got sort of you know

39:16

sexual education classes classes about

39:18

drugs no one came in and told me about

39:21

the benefits of sleep why aren't we

39:24

doing that then next I would move down

39:26

into the family because there is

39:28

Prejudice in families with sleep it's

39:31

this notion of

39:33

parents of teenagers and these Teenagers

39:36

by the way it's not their fault they

39:39

have a shift in their chronotype in

39:41

their circadian rhythm that when they go

39:43

through puberty when they're going

39:44

through adolescence they get fast

39:46

forwarded in time so when they were

39:49

eight or nine years old they would be

39:51

going to bed you know sort of early in

39:53

the evening but now as teenagers they

39:55

seem to be stubborn and they're staying

39:58

awake staying awake until midnight 1am

40:02

and they won't get into bed it is not

40:05

their fault because they have a

40:07

biologically wired shift in the tendency

40:11

of when they want to wake up and when

40:12

they want to sleep why am I bringing

40:14

this up about this sort of

40:16

mismanagement in the home because

40:18

parents at weekends will go into the

40:21

room of the teenagers they'll you know

40:22

pull open the curtains they will pull

40:25

the covers off and they say you're

40:26

wasting the day you know and firstly

40:29

what they're doing is probably trying to

40:32

sleep off a debt that we've lumbered

40:34

them with during the week because of

40:36

this incessant model of early school

40:38

start times which I'll I'll come back to

40:41

but within the home if you ask parents

40:44

of teenagers what percent of parents

40:47

think that their teenagers are getting

40:49

sufficient sleep and about 70 of them

40:52

will say yes my teenager is getting

40:53

sufficient sleep when you look at the

40:55

data only about 15 of teenagers are

40:58

actually getting the sleep that they

41:00

need so what happens is a parent-child

41:03

transmission of sleep neglect they're

41:06

saying you're lazy you're slothful so

41:08

then what happens well in 15 20 years

41:11

time now that teenager has got a teenage

41:15

child what do they do they go back in

41:18

the room they rip the curtains open they

41:19

say you're wasting the day because

41:21

that's what they were told so we need to

41:23

break that down too and then finally we

41:25

need to come to the individual and we

41:27

need to solve the individual's sleep

41:29

problems so it's a very long answer and

41:31

I'm desperately sorry to a very big

41:33

question as to what I would do if I was

41:35

off for a day but I hope that gives you

41:37

some sense of of the depth that I think

41:42

we need to go to I've tried to think

41:43

about the question a lot it's not

41:45

particularly well executed I don't think

41:47

I was very eloquent there but I hope

41:48

that gives a sense it sounded perfectly

41:50

eloquent to me it sounded like a

41:51

Manifesto so

41:53

um hopefully if there are people

41:54

listening from governments which I'm

41:55

sure there are because you know I hear

41:57

about that sometimes which is quite

41:59

bizarre but um I

42:00

I'm sure they'll be getting in touch

42:02

with you very quickly going back to the

42:03

top of that that stag on the company

42:06

level so as a CEO or a CFO or an

42:09

employer whatever

42:10

um there are some companies that are

42:12

incentivizing their team members to

42:13

sleep right is there any data showing

42:15

the efficacy of that

42:18

is data that we have and it's

42:21

bi-directional both the efficacy of when

42:24

you increase sleep and also the

42:27

detriment when you don't allow sleep so

42:31

a great example was

42:33

um NASA back in the

42:37

1980s they were looking at using naps in

42:42

the astronaut program because when

42:45

you're up and you're orbiting Earth you

42:47

will actually be cycling Earth you know

42:50

really quite quickly and you will get to

42:53

see depending on the orbit maybe

42:55

somewhere between 10 to 15 sunrises

42:58

every 24 hours which sounds I mean

43:01

amazing and remarkable but trust me in

43:04

terms of your sleep it is very

43:06

dislocating

43:08

so they were looking at how to use naps

43:11

strategically to improve performance

43:13

because the weakest link on any space

43:16

mission and we've done some work with

43:17

NASA

43:18

um is the human being themselves and

43:22

they can cause catastrophic failure now

43:24

if you make an error at work and you're

43:26

here terrestrially on the ground you

43:29

know it's probably non-trivial make an

43:31

error when you're up in space it can be

43:34

a big deal so they were looking at that

43:36

and what they found was that these naps

43:39

anywhere between 20 minutes to an hour

43:42

could increase productivity on these

43:46

different tasks by about 34 and

43:49

increased General alertness by over 50

43:51

percent and in fact the data was so

43:53

powerful that it ended up being

43:55

transmitted to all of the terrestrial

43:57

workers on the ground that NASA would

43:59

start to in it was what was called NASA

44:01

naps it was a NASA nap culture now NASA

44:05

isn't desperately compassionate by any

44:07

means it's a great organized

44:09

but they just like companies like Google

44:12

or Facebook they understand the pounds

44:15

and pennies cents you know the dollars

44:17

and the cents version of productivity so

44:21

anything that returns productivity they

44:23

will invest in and some of those

44:24

companies you know I um I did some work

44:28

uh Google uh during a sabbatical and

44:30

there on their campus they will have

44:32

these nap pods and they will have these

44:34

what are called

44:35

rooms where you can go and you can take

44:38

a nap so think about 20 years ago you

44:43

would never imagine a company paying you

44:45

to sleep on the job if you have caught

44:47

sleeping on the job you'd probably be

44:49

fired now companies are incentivizing it

44:52

not because they are thinking

44:54

compassionately or empathetically about

44:56

the health or the wellness of their

44:58

individuals it is because they

45:00

understand that it transacts marked

45:02

productivity so NASA is a good example

45:04

when you give sleep you get something

45:06

back but I can go back to the reverse of

45:08

that

45:09

why we think that a lack of sleep does

45:12

not equal more productivity is for at

45:14

least five reasons first when you survey

45:17

and we've we can do these studies in the

45:19

in the laboratory too when you

45:20

undersleep employees they will choose

45:24

less challenging problems so if you give

45:26

them an array of work problems they will

45:28

just simply you know check email they'll

45:31

listen to phone messages they don't dig

45:32

into deep Project work second of the

45:36

problems that they do take on in their

45:38

work they will produce fewer Creative

45:41

Solutions and after all creativity and

45:45

Ingenuity are supposed to be the two

45:47

engines that drive businesses forward in

45:50

terms of their productivity in their

45:52

revenue

45:53

third that interesting finding that

45:55

we've discovered is that when underslept

45:58

employees start working in teams they

46:00

will slack off they won't do their work

46:03

they will let other people do their work

46:05

it's what we call social loafing so they

46:07

ride the coattails of other people's

46:09

hard work which won't breed a good

46:12

atmosphere in your company you know

46:14

trust me

46:15

the fourth thing that we found is that

46:17

underslept employees are more deviant

46:19

that they're more likely to fudge data

46:22

in spreadsheets they're more likely to

46:24

falsely claim uh money for reimbursement

46:27

that was inappropriate

46:30

the final thing is that a lack of sleep

46:31

will go all the way to the top of the

46:33

business chain what we found is that the

46:36

more or less sleep that a business

46:38

leader has had from one night to the

46:41

next to the next the more or less

46:43

charismatic that employees will rate

46:46

that business leader from one day to the

46:49

next to the next even though the

46:51

employees themselves they know nothing

46:53

about the sleep that that CEO has been

46:56

getting it's evidential in how

46:59

charismatic that CEO is

47:02

so you can add all of these things up

47:04

and no wonder you know

47:07

if you don't snooze you lose in the case

47:10

of business in that regard that's why I

47:12

can produce I think a non-trivial case

47:14

for business by the way the other aspect

47:16

that is hugely costly to businesses and

47:19

when I go and speak to businesses about

47:21

why they should value sleep

47:24

if you offer it on the grounds of again

47:27

sort of compassion or mental health

47:30

probably don't want to listen when you

47:32

convert it into the cost of the company

47:34

and how much it's fleecing them in terms

47:36

of their profits then they start to pay

47:39

attention

47:40

underslept employees will take on

47:44

average about 11 more days uh sick days

47:48

throughout the year relative to

47:50

well-slept individuals so you're

47:52

essentially just paying people

47:53

additionally for 11 days of work that

47:55

they will never give you when you are

47:57

under sleeping them secondly the

48:00

utilization of Health Care Resources

48:02

increases by about 80 percent so the

48:06

cost to either you the company here in

48:08

the US where your company is paying for

48:09

your health care or the cost of the

48:11

government for example in the United

48:13

Kingdom is astronomical

48:16

and also then the co what we call

48:19

comorbid diseases your rates of obesity

48:22

diabetes cardiovascular disease mental

48:25

health conditions all of these things

48:27

escalate as underslept employees

48:29

continue to get even more underslept

48:33

so there is no strong case that I've

48:37

seen that leads me to think businesses

48:41

should foster the mentality of

48:43

insufficient sleep quite the opposite so

48:46

that's hopefully an answer to your

48:47

question we can look at it

48:48

bi-directionally when we give sleep back

48:50

do you get productivity yes when you

48:52

take sleep away the things implode

48:54

rapidly yes and is it costly to your

48:56

company very much so

48:58

on that point of naps and you know

49:00

Google sleep pods naps and things like

49:02

that there was a point in my life where

49:04

I because I learned about REM sleep and

49:07

the importance of REM sleeping deep

49:08

sleep and that happens a little bit

49:10

further on into my you know the 90

49:12

minute look at me trying to tell a Sleep

49:14

Experts well I love it but you see what

49:16

I mean like this is my very this is my

49:19

monkey brain so I didn't understand the

49:20

subject matter very well still really

49:21

don't to be honest but in the first it

49:24

takes me a significant amount of time to

49:26

get to Deep Sleep into REM sleep

49:28

how long on average would you say it

49:30

takes for it for some you know yeah so

49:33

you will probably go into light sleep in

49:35

the first 10 to 15 minutes then you'll

49:37

go down into deep sleep you'll stay

49:39

there for about 30 40 minutes and then

49:42

you'll start to rise back up and you'll

49:44

pop up and you'll have a short REM sleep

49:45

period and then you complete the non-rem

49:49

to REM cycle after about 90 minutes and

49:52

back down you go again down into non-rem

49:54

and up into REM so on average for human

49:56

beings it's 90 minutes so I therefore

50:00

assumed that napping really does nothing

50:02

because I thought well it takes me so

50:04

long to get to REM sleep and to deep

50:06

sleep that there's if I've got 15

50:07

minutes 20 minutes to to nap it's just a

50:11

waste of time right was I wrong or was I

50:13

right

50:14

you were

50:16

understandably wrong okay good I'm happy

50:20

because I I've always rejected naps

50:23

because I thought they don't matter

50:24

because it takes me so long to get to a

50:26

restorative State anyway so so we've

50:28

done lots of different studies with naps

50:30

we and other colleagues uh too and what

50:32

we found is that naps can transact some

50:35

fantastic benefits they can improve

50:37

cardiovascular health lower blood

50:39

pressure they can improve your learning

50:42

and memory abilities they can reset the

50:45

emotional

50:48

north of your magnetic compass in a good

50:50

way where you can de-escalate negative

50:53

emotions and increase positive emotions

50:56

um so naps certainly are a good thing

51:00

but with a big caveat that I'll come

51:02

back to

51:04

um yes you're right in the sense that to

51:06

get a full cycle of sleep and to get

51:09

into REM sleep you would probably have

51:11

to make that nap about 90 minutes and in

51:14

fact a lot of the cities that we do we

51:17

will use a 90-minute nap duration of

51:19

time so that the brain can cycle through

51:22

all of those different stages of sleep

51:25

but you don't need to nor would I

51:27

suggest that you do

51:28

what we found is that different stages

51:30

of sleep perform different functions for

51:33

the brain at different times of night

51:36

there are actually four separate stages

51:38

stages one through four increasing in

51:40

their depth of sleep so stages three and

51:43

four are those really deep stages of

51:45

non-rem sleep stages one and two that's

51:47

the lighter form of non-rem and then you

51:49

have rapid eye movement sleep or what we

51:51

think of as dream sleep and people will

51:53

sometimes say to me how do I get more

51:55

REM sleep or how do I get more deep

51:57

sleep I might response to them is why do

52:00

you want to get more REM sleep and their

52:02

answer is what isn't that the good stuff

52:04

and it turns out that there is no good

52:07

stuff it's all good stuff you know maybe

52:10

with the exception of that light stage

52:12

one non-rem sleep that's shallow sleep

52:14

and we typically don't like to see too

52:16

much of that but stage two non-rem sleep

52:18

three and four they all have their

52:21

different functions that we've

52:22

discovered and REM sleep has its

52:24

functions so you need all of them you

52:26

can't Short change any of them but for

52:29

nap

52:31

what we found is that you can get nice

52:34

benefits for things like your learning

52:36

and your memory and it can even reduce

52:38

some level of anxiety up to about 20

52:42

minutes you can in fact you can nap I

52:44

think the study one of the studies they

52:46

brought a nap down to about nine minutes

52:48

in duration and there was still some

52:51

basic improvements for your sort of

52:52

General level of alertness and reaction

52:54

time for example if you're an athlete

52:56

that's that's non-trivial

52:58

so um so the reason I would say

53:03

be careful with naps is for two main

53:07

um sort of suggestions the first is try

53:09

not to nap for about longer than 20

53:11

minutes because once you go past 20

53:13

minutes you really start to go down into

53:15

those deeper stages of non-rem sleep and

53:18

if you wake up after about 45 minutes or

53:21

60 minutes

53:22

it's not a problem I'm not suggesting

53:24

that you shouldn't or you couldn't I'm

53:27

just saying be aware because when you

53:28

come out of that deep sleep and you wake

53:30

up from that deep sleep normally that's

53:33

not how you wake up you will usually

53:35

wake up out of lighter stages of sleep

53:37

or out of REM sleep it's rare that we

53:39

wake up out of deep sleep but if you nap

53:41

and you snap for about 40 minutes you'll

53:43

probably go down into deep sleep and at

53:46

that point where if you wake up and your

53:48

alarm goes off then you're going to feel

53:51

almost miserable and worse than you did

53:53

before the nap because you have what's

53:55

called Sleep inertia which is

53:57

essentially a sleep hangover where the

54:00

brain is still sort of pulled back into

54:02

that deep sleep State and it can take

54:05

you almost an hour before you feel like

54:07

you're back up to operating temperature

54:09

and you're up to Motorway speed so I

54:12

would say keep it to 20 minutes and you

54:14

don't suffer too much of that inertia

54:16

you still get some nice benefits also

54:19

don't nap too late in the afternoon

54:22

also the final part is if you are

54:26

struggling with sleep at night if you're

54:27

someone who has insomnia or sleep

54:29

difficulties do not nap during the day

54:33

it's the worst thing that you can be

54:35

doing because when we're awake during

54:37

the day we build up a sleepiness

54:40

chemical in our brain it's called

54:41

adenosine

54:43

and the longer that we're awake the more

54:45

adenosine that builds up the more

54:47

denosine that builds up the sleepier and

54:49

sleepier that we feel

54:51

and when we sleep the brain gets the

54:53

chance to clear away all of that

54:55

adenosine all of that sleepiness and

54:57

somewhere between seven to nine hours

54:59

after sleeping a full night the brain

55:02

has evacuated all of that sleepiness

55:05

chemical of that adenosine so that then

55:08

we should wake up and we should feel

55:09

refreshed and restored and not needing

55:12

caffeine to function

55:15

why is that relevant to naps well it's

55:17

relevant to naps because when you take a

55:20

nap you're essentially it's like a

55:22

pressure valve on a cooker you're just

55:24

releasing some of that healthy

55:26

sleepiness that you've been building up

55:27

and therefore if you are struggling with

55:30

sleep at night and then you nap during

55:32

the day it's terrible because you're

55:35

taking away all of that healthy good

55:36

weight of sleepiness that we've been

55:39

trying to build up on your shoulders to

55:42

give you the best chance of a good night

55:44

of sleep

55:45

that's why I would say if you are

55:47

suffering from insomnia don't nap during

55:49

the day also even if you are if you

55:51

don't struggle with sleep at night try

55:53

not to nap after about 3 P.M in the

55:56

afternoon or 2 P.M

55:58

napping late in the afternoon or in the

56:01

early evening it's a little bit like

56:02

snacking before your main meal it just

56:05

takes the appetite off your sleep hunger

56:07

so try not to do that but naps for the

56:10

most part if you don't struggle with

56:12

sleep they are wonderful things just

56:14

keep in mind the 20-minute sort of idea

56:16

you mentioned caffeine there a topic

56:18

I've modeled over over and over again on

56:21

this show

56:23

um because as I've said to maybe three

56:25

or four of my guests now

56:27

it feels like caffeine is a miracle drug

56:30

that comes with no apparent cost but

56:32

when I think about things like anxiety

56:34

and I know shallow sleep States I've

56:36

always pondered that maybe caffeine is

56:38

playing a role in that you said you

56:40

you're you're Pro caffeine you're a

56:41

caffeine Drinker yourself

56:43

so I am not a caffeine Drinker myself

56:45

but I am Pro coffee oh okay and I'm I'll

56:50

tell you why I'm very thoughtful about

56:52

my wording between caffeine and coffee

56:54

there and to your point it's a it's

56:57

another astute one which is

57:00

it would you know is it a miracle drug

57:02

with no cost

57:05

in biology and Medicine There is almost

57:08

no free lunch

57:12

um and

57:14

that is true when it comes to caffeine

57:16

and sleep so

57:18

perhaps I'll give the skinny on caffeine

57:21

and how it impacts your sleep but then

57:24

Circle back around to what seems an

57:26

oxymoronic statement for me which is why

57:28

I'm still Pro coffee

57:31

um caffeine will hurt your sleep and

57:34

probably at least

57:35

three ways some of which you most people

57:38

are not aware of the first issue is the

57:41

duration of its action

57:43

so caffeine has what we call a half-life

57:46

of about five to six hours in other

57:49

words after about five to six hours half

57:51

of that caffeine is still in your system

57:54

what that means is that caffeine has a

57:56

quarter life of somewhere between 10 to

57:58

12 hours so if you have a cup of coffee

58:01

at noon at midday a quarter of that

58:05

caffeine is still in your brain at

58:07

midnight

58:08

so having a cup of coffee at noon and

58:11

it's hyperbole in truth probably or it's

58:14

a little bit hyperbolic but it's almost

58:16

the equivalent of a coffee at noon as

58:19

the equivalent of you know talking

58:20

yourself into bed and just before you

58:22

turn the light out you Swig a quarter of

58:24

a cup of coffee and you hope for a good

58:26

night of sleep and it's probably not

58:28

going to happen so that's the first

58:30

thing to keep in mind is that the timing

58:32

of caffeine

58:34

the second is that caffeine is a

58:37

stimulant now everyone knows this

58:39

everyone knows that caffeine can make

58:40

you more alert and more awake by the way

58:42

how does it do that

58:44

um it comes back to adenosine which is

58:46

the chemical that we spoke about the

58:47

sleepiness chemical it's no coincidence

58:50

that those two things sound the same at

58:52

the end of the name caffeine and

58:53

adenosine

58:55

caffeine will actually race into your

58:57

brain and it will latch onto the

59:00

adenosine receptors the welcome sites in

59:02

your brain and it has very sharp elbows

59:05

and it will force away the adenosine

59:07

from those receptors and it will hijack

59:09

those receptors now at this point you

59:12

may be thinking well hang on a second if

59:14

it's latching onto those sleepiness

59:16

chemical receptors shouldn't caffeine

59:19

make you more sleepy and the answer is

59:21

no because what it does is it just

59:23

latches onto the receptor and it

59:25

inactivates it essentially so it masks

59:29

the receptor

59:30

what caffeine does then is race into

59:33

your brain you've got all of this

59:35

sleepiness at 9 00 PM or 10 p.m you have

59:38

an espresso because you're trying to

59:39

power through and finish the report or

59:41

you know the presentation for your sort

59:43

of your pitch uh deck for your startup

59:45

company

59:46

and that caffeine races in it latches

59:50

onto the adenosine receptors

59:52

and blocks the signal of adenosine so

59:55

now your brain was thinking I'm starting

59:57

to get tired it's 10 p.m but now all of

60:00

a sudden that signal is blocked and a

60:03

caffeine is like hitting the mute button

60:05

on your television remote controller it

60:07

just mutes the signal of sleepiness so

60:10

now you think well no I don't feel

60:12

sleepy anymore and here's the danger

60:14

that even though well when the caffeine

60:16

is in your system and it's latched onto

60:19

the receptors that adenosine is still

60:21

there it's not going away in fact if

60:23

anything during the course of the

60:25

caffeine in your system it continues to

60:27

build and build

60:28

and now when the caffeine finally gets

60:31

metabolized and excreted out of your

60:32

system not only do you go back to the

60:35

sleepiness that you had many hours

60:37

before it's that plus all of the

60:40

adenosine sleepiness that's been

60:41

building up during that time in between

60:43

so you get hit with this huge tsunami

60:46

wave of sleepiness and that's what we

60:49

call the caffeine crash

60:51

so the one of the issues so that's sort

60:54

of caffeine in terms of how it works in

60:56

its timing another issue is that it

60:59

creates anxiety just as you said and

61:01

anxiety is probably one of the greatest

61:03

enemies of sleep it's one of the

61:06

principal reasons that underlies

61:07

insomnia is a physiological state of

61:09

anxiety that your fight or flight branch

61:11

of the nervous system is ratcheted up

61:13

that's what caffeine will do it needs to

61:16

do the opposite for you to fall asleep

61:18

that's why you can have what we call the

61:20

tired but wired phenomenon where you say

61:22

I'm so desperately tired I am so tired

61:24

but I'm just so wired that I can't fall

61:27

asleep it's because your nervous system

61:29

is too amped up caffeine will trigger

61:32

that amping up

61:33

then at that point if you're struggling

61:35

to fall asleep because you've got too

61:37

much caffeine on board it is what we

61:39

call anxiogenic so now you start to

61:41

worry

61:42

and the last thing you need to do when

61:45

your head hits the pillow for good sleep

61:47

is worry because when you start to worry

61:49

you start to ruminate and when you

61:52

ruminate you catastrophize and when you

61:55

catastrophize you're dead in the water

61:57

for the next two hours when it comes to

61:58

sleep because we have this sense that

62:01

you know things at night in the darkness

62:04

of night

62:06

are so much bigger than they are in the

62:09

brightness of day

62:10

and we start worrying you know in this

62:12

modern era we're constantly on reception

62:15

and very rarely do we do reflection

62:18

unfortunately the only time when we

62:20

typically do a reflection is when we

62:22

turn off the light and our head hits the

62:24

pillow and that is the last time you

62:26

want to be doing reflection so that's

62:28

the the second problem with caffeine

62:29

it's anxiogenic and it only makes you

62:31

sort of almost like the Woody Allen

62:33

neurotic of the Sleep World

62:35

the final part of caffeine is that it's

62:38

very good at blocking your deep sleep

62:41

so we've done a number of these studies

62:42

where we'll give people a standard dose

62:44

of caffeine let's say 100 150 milligrams

62:46

200 milligrams which is probably you

62:49

know a cup and a half of good strong

62:50

coffee

62:52

and then we put you to bed and we look

62:54

at the amount of deep sleep and it will

62:55

strip away your deep sleep by about

62:57

somewhere between 15 to 30 percent

63:01

now to put that in context to drop your

63:04

deep sleep by 30 I'd probably have to

63:07

age you by about 40 years for zero or

63:11

you could do it every night with an

63:12

espresso with with dinner and that's one

63:14

of the problems people will say to me

63:16

look I'm one of those people who I can

63:18

have two espressos with dinner and I

63:21

fall asleep fine and I stay asleep so no

63:24

harm no foul well not necessarily

63:26

because even if you fall asleep and you

63:28

stay asleep you're not aware of the lack

63:31

of the deep sleep that you're not

63:33

getting because of the caffeine and so

63:35

now you wake up the next day and you

63:36

think well I don't remember having a

63:38

hard time falling asleep I don't

63:39

remember waking up but now I'm reaching

63:42

for two or three cups of coffee the next

63:44

morning rather than my standard one cup

63:45

of coffee because I don't feel refreshed

63:47

and restored by my sleep because I was

63:49

lacking the amount of deep sleep and

63:51

deep sleep what does that Rob us of the

63:53

lack of deep sleep so lack of deep sleep

63:55

deep sleep is critical for regulating

63:57

your cardiovascular system it's the time

63:59

when we do replenish the immune system

64:02

it also regulates your metabolic system

64:04

so it controls the hormones such as

64:07

insulin that will regulate your blood

64:09

sugar and you will become blood sugar

64:10

dysregulated without sufficient deep

64:12

sleep upstairs in the brain deep sleep

64:15

will strengthen and consolidate and

64:18

secure new memories into your brain they

64:20

will prevent those memories from being

64:22

forgotten deep sleep is also the time

64:24

when we cleanse the brain of metabolic

64:26

toxins particularly the toxins that are

64:28

related to Alzheimer's disease so

64:30

getting a lack of deep sleep is I would

64:32

say a non-trivial thing in that regard

64:36

but

64:38

I don't want to be also puritanical here

64:42

and this is where I'm going to change my

64:44

title tune

64:46

I am not here to tell anyone how to live

64:49

their life I have no right to tell

64:51

anyone how to live the life I'm just a

64:53

scientist

64:55

all I want to try and do is gift you the

64:58

science and the knowledge of sleep so

64:59

that you can make an informed choice

65:02

and after all and the same is true for

65:04

alcohol too and sleep you know life is

65:07

to be lived to a certain degree

65:10

you know no one wants to be the

65:11

healthiest guy in the graveyard I don't

65:14

want to be that way too I want to live

65:16

life just with moderation the reason I

65:20

don't drink

65:21

uh caffeine is not because I'm so pure

65:25

technical I want to be the poster child

65:26

of good sleep I love the smell of

65:29

freshly ground coffee in the morning and

65:31

it's a great ritual it's just that I've

65:33

ruined my genetics and I am one of these

65:35

slow caffeine metabolizers so you can do

65:37

these genetic kits online and they will

65:40

tell you are you a slow metabolizer or a

65:43

fast metabolizer so that's the

65:45

variability that's why some people say

65:46

look I'm pretty immune to caffeine

65:48

others will say no I'm not

65:50

um why do I now favor coffee I was

65:54

actually quite

65:57

anti-caffeine and coffee when I first

65:59

came out with the book just looking at

66:00

the studies but now the data is

66:03

immensely compelling the health benefits

66:06

associated with coffee are undeniable

66:09

study after study after today and we can

66:11

put them all together in this big what

66:13

we call a meta-analysis study and it is

66:16

so strikingly clear that coffee drinking

66:18

coffee is a good thing for you from a

66:21

health perspective

66:24

two things to say about that the first

66:27

is that it's got nothing to do with the

66:30

caffeine

66:31

and a lot of people have sort of rightly

66:34

challenged me to say look you say how

66:36

problematic sleep can be when you're

66:38

drinking too much caffeine

66:40

but yet coffee is associated with many

66:43

of the same health benefits that sleep

66:45

is associated with but coffee is

66:48

supposed to hurt your sleep how do you

66:50

reconcile those two Matt Walker and the

66:54

answer is very simple antioxidants

66:58

because it turns out that the Coffee

67:00

Bean contains a whopping dose of

67:03

antioxidants things such as is what's

67:07

got other things such as Cafe style but

67:09

it's got a bunch of incredible

67:10

antioxidants probably the most powerful

67:13

of them in terms of the Coffee Bean is

67:15

something called chlorogenic acid now

67:18

don't worry it's not chlorine it's not

67:19

chloride it's not bleach chlorogenic

67:22

acid is very different

67:24

and what's happened in the modern world

67:27

is that we on we have and struggle with

67:31

our diet so much because we don't eat

67:33

enough Whole Foods Etc so what's

67:36

happened is that

67:39

the Coffee Bean has been now asked to

67:42

carry the Herculean weight of all of our

67:46

antioxidant needs on its shoulders

67:49

and where most people get the majority

67:51

of their antioxidants is by way of

67:55

drinking coffee that's why coffee is

67:57

associated with so many health benefits

67:59

it's not the caffeine case in point if

68:01

you look at the studies with

68:03

decaffeinated coffee you get very

68:05

similar health benefits again it's not

68:08

the caffeine it's the coffee itself so

68:10

the bottom line here is drink coffee but

68:15

I would say the dose and the timing make

68:18

the poison so try to limit yourself to

68:21

about two cups of coffee three cups of

68:24

coffee maximum because if you look at

68:26

the health benefits by the way it's a

68:28

dose it's not a dose response we're at

68:30

linear where the more and more coffee

68:31

you drink the more and more healthy you

68:33

become it Peaks at about two to three

68:36

and then actually starts to go down in

68:37

the opposite direction for lots of

68:39

reasons that we can speak about so

68:41

dose and the timing make the poison when

68:43

it comes to coffee so you drink decaf so

68:46

I do drink decaf so I will drink coffee

68:48

just because I love the smell and I do

68:50

enjoy the taste of it but I drink uh

68:53

decaffeinated coffee

68:54

I would love to drink a caffeinated

68:57

coffee too because I

68:59

you know I'm sure it would be

69:01

interesting because I work out every day

69:03

and I work out every morning and so many

69:05

of the health coaches that I speak with

69:07

and health professionals say you know

69:09

you should definitely get a shot of

69:11

caffeine and boost your workout and

69:12

actually the data on that is pretty

69:14

clear too that you're lifting for

69:16

example in the gym and your metabolic

69:19

activity is stronger when you've had

69:21

pre-caffeine doses but it's also

69:23

stronger when you sleep so but exactly

69:25

and that's the problem so and sleep is

69:28

I would argue much more beneficial to

69:32

health and if you're trying to work out

69:34

or you're trying to be an athlete or

69:36

perform

69:37

sleep Will trump caffeine five ways till

69:40

Tuesday I mean sleep is probably the

69:43

very best legal performance enhancing

69:46

drug that we know of that not enough

69:48

athletes are abusing

69:51

as you might know the show's now

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70:02

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70:51

other sort of ongoing stereotypes that

70:53

I've always wondered if it was wrong or

70:54

right or whatever now I get a chance to

70:56

ask you is about this culture of sleep

70:59

medication so I've got some friends who

71:01

who might have I don't know prescribed

71:04

sleep medication but I've got a lot of

71:05

friends also that use

71:06

what they call sort of natural they

71:09

always use the word natural natural

71:10

something so it's like natural sleep

71:12

tablets yeah what's your perspective on

71:15

this culture of us of humans taking

71:18

sleep tablets to get them to feel sleepy

71:20

and go off to sleep at night usually

71:22

when people ask me that question

71:24

personally I the first thing I ask them

71:26

is why is it that you think you're not

71:28

able to sleep

71:30

and try to reverse engineer the question

71:32

from there before we even start thinking

71:34

about sticking Band-Aids on wounds I

71:38

firstly want to ask what's causing the

71:39

infection because we can keep bandaging

71:42

it for all we like but if it keeps

71:45

festering it's probably not going to go

71:47

away anytime soon is there a problem to

71:49

keep bandaging it it is a problem right

71:52

now we don't typically Advocate sleeping

71:55

pills as the first line defense agent

71:57

against or for insomnia as a treatment

72:00

in fact in 2016 the American cult and

72:03

again this is me simply describing the

72:05

science this is me being descriptive of

72:08

the science not prescriptive in terms of

72:11

medicine because I'm not a medical

72:12

doctor

72:14

um

72:15

but in 2016 the American College of

72:18

Physicians they had a expert panel who

72:21

surveyed all of the literature on

72:22

classic sleeping pills and what they

72:25

suggested was that sleeping pills must

72:27

no longer be the first line treatment

72:29

for insomnia it has to be cognitive

72:33

behavioral therapy for insomnia or we

72:35

call cbti which is a psychological

72:37

intervention that we can speak about but

72:39

their recommendation was that they found

72:42

I think their wording was small and of

72:45

questionable clinical importance in

72:48

terms of the benefits of sleeping pills

72:50

now there is a time and a place

72:53

for in clinical medicine for sleeping

72:55

pills but usually as an adjunct in

72:59

combination with cognitive behavioral

73:00

therapy they are not advocated for

73:03

long-term use but so they're usually

73:06

advocated for short-term use weeks

73:08

most people have been on them for months

73:10

if not years these classic sleeping

73:12

pills and that's a problem because those

73:15

sleeping pills are in a class of drugs

73:17

that we call the sedative hypnotics

73:20

and sedation is not sleep

73:23

for some subset of some people there are

73:25

some of these quote unquote sleep

73:28

supplements that may benefit but overall

73:32

the studies are very clear none of them

73:35

are efficacious

73:37

and when you think about it it makes

73:39

sense if there was some cheap sleep

73:42

supplement that you could buy on Amazon

73:44

that was the shangri-lar of good sleep

73:47

that was this miracle sleep drug

73:50

don't you think that a pharmaceutical

73:51

company would have patented it 20 years

73:53

ago and be making billions of dollars

73:55

from it you know that alone tells you

73:57

all that you need to know about you know

74:00

these natural sleep supplements

74:02

cognitive behavioral therapy for

74:03

insomnia though seems to be the kind of

74:06

the front line of

74:07

prescribed defense against a lack of

74:10

sleep in so many conditions what exactly

74:12

is that therapy aiming to do what like

74:15

what does it do for for somebody

74:17

great question so in some ways that the

74:20

title tries to suggest what it what it

74:23

does but not particularly well perhaps

74:25

so it focuses on cognitive aspects and

74:29

it focuses on behavioral aspects

74:31

so for the cognitive aspects when we do

74:34

cognitive behavioral therapy working

74:36

with the patient we'll try to focus on

74:38

thoughts and beliefs and ideas around

74:41

sleep do they have anxiety around the

74:44

bedroom most of them do I can't sleep

74:46

because I can't sleep so every time I

74:48

walk into the bedroom my bed is the

74:50

enemy and I look at the bedroom I look

74:52

at the bed and I just know that that

74:55

means I'm going to have a bad night of

74:57

sleep so what's happened is that at that

74:59

point your sleep controls you

75:03

and you've lost all confidence in your

75:05

ability to sleep and we need to course

75:08

correct that so one of the things we do

75:10

in cognitive behavioral therapy is that

75:11

we lower that anxiety and we say look

75:13

everyone has a bad night of sleep even a

75:16

bad couple of nights of sleep in fact I

75:18

will tell you I don't sleep perfectly

75:20

well all the time too I've had at least

75:22

two very severe bouts of insomnia in my

75:24

life

75:26

we all have a bad night of sleep it

75:28

doesn't mean that tomorrow you're going

75:30

to wake up with depression or

75:32

Alzheimer's disease don't worry you're

75:34

not going to get cancer you know just

75:37

because you've had a bad night of sleep

75:38

so we start to change people's

75:40

misbeliefs about sleep and we try to get

75:43

them back from being catastrophic about

75:45

this idea of my not sleeping

75:48

so we that's the cognitive aspect we

75:50

start to lower their anxiety around the

75:52

bed and and the bedroom we start to try

75:55

to build confidence back we start to

75:57

reduce their expectations about you know

76:00

what is reasonable sleep well right now

76:02

you're getting four or five hours of

76:04

sleep and we can do better but don't

76:07

start thinking that you need to get

76:09

eight hours of sleep straight out the

76:10

box let's just manage it that's just

76:12

because it's going to stress you out

76:13

right it's only going to make matters

76:15

worse right okay you know when you're

76:17

struggling with sleep in the middle of

76:18

the night and you're Wide Awake you're

76:20

laying in bed and you're thinking oh my

76:21

god I've got five hours left before I've

76:22

got to go to work it's the last you know

76:25

it's a little bit like trying to

76:26

remember someone's name the harder you

76:28

try the further you push it away

76:31

so would you say and that's what do I do

76:33

in that situation you it's 2 A.M in the

76:34

morning you've got to be up at seven

76:36

there's a flight you're getting on so

76:37

whatever yeah what should one do because

76:40

from what I was reading in chapter 14 I

76:43

was I was hearing that maybe I should

76:44

get out of bed or not just sit there and

76:46

ruminate

76:47

you know into the early hours of the

76:49

morning or do I stay in bed and do

76:52

something what does one do the

76:55

prototypical recommendation is that

76:57

after about 30 minutes of time a week

76:59

you should get out of your bed and you

77:01

should just go to a different room and

77:02

do something like you know read a book

77:05

or listen to a podcast don't eat because

77:07

it then trains your brain to wake up to

77:10

do that don't stop working or getting in

77:12

front of a computer screen you know I

77:14

said listen to a podcast sure you know

77:16

just make sure your phone's in you know

77:18

you don't start scrolling any more than

77:20

that but you can do relaxing things

77:22

stretch meditate

77:24

the reason is because if you start to

77:26

spend a lot of time awake in your bed

77:28

your brain is an incredibly associative

77:30

device and very quickly it will start to

77:33

learn that this thing called your bed is

77:35

this place where I'm always awake and

77:37

therefore you start to learn through

77:39

this repeated Loop of behavior that I'm

77:43

always going to be wide awake in bed and

77:45

we need to break that Association and

77:46

that's why we say get out of bed after

77:48

about 30 minutes because you're just

77:50

training your brain to think that this

77:51

thing called my bed is the place where

77:53

I'm never asleep and we want to break

77:55

that and only return to bed when you're

77:58

sleepy and there's no time limit for

78:00

that and that way gradually it's much

78:02

better because you will relearn the

78:03

association that your bed just as when

78:06

you were young is guaranteed that your

78:07

bed is this place where you will always

78:09

be asleep

78:10

the problem with that is many people

78:12

don't want you know it's the middle of

78:13

the night it's dark it's cold I'm not

78:16

I'm just not going to get out of bed so

78:19

what's your other what what else have

78:21

you got in your toolbox Matt

78:23

um at that point I would say okay that's

78:25

reasonable

78:27

the first thing I would suggest is

78:28

meditation

78:29

you know I am a hard-known Scientist and

78:32

when I was researching that the book

78:35

I was you know I just thought this

78:37

sounds all a bit woo-woo and you know I

78:39

uh live and work in Berkeley California

78:42

which is kind of you know the Free

78:44

Speech you know flower power movement

78:46

San Francisco flowers and you have

78:47

business I just thought this is all of

78:49

it you know holding hands and singing

78:52

come by ours this is not for me this

78:54

this meditation stuff I couldn't get

78:57

away from the strength of the data it

78:59

was immensely powerful regarding sleep

79:01

and its benefits on insomnia and sleep

79:03

so I started meditating and uh now I

79:08

meditate for 10 minutes before bed every

79:11

single night and I've been doing that

79:12

for about four years so I would say if

79:15

even if it's in the middle of the night

79:16

and if I wake up in the middle of the

79:18

night I'll start trying to walk myself

79:19

through a meditation

79:21

um

79:22

you reference their listening to

79:25

podcasts etc etc you know doing

79:27

something else to stimulate the brain I

79:29

when I go to bed I have to have

79:30

something playing I say have to I

79:32

shouldn't be that definitive I like to

79:34

have something playing some kind of

79:36

sound or noise whatever and much to my

79:39

partner's dismay my content of

79:43

preference is

79:45

serial killer

79:48

podcasts or documentaries or just like

79:50

something which is really going to grab

79:52

hold of my brain and focus me so

79:56

something like it has to be really

79:57

interesting to me for me to be able to

79:58

focus on it my partner is the opposite

80:00

again she likes um silence

80:04

why do I listen to serial killers it's

80:08

different for different people's

80:10

constitutions yeah yeah and public

80:12

psychologies uh and you know I can

80:14

pathologize to you or you like if if you

80:16

would wish me to but I would say it

80:18

what's fundamentally going on here with

80:21

meditation and I'll come back to an

80:23

alternative too but the reason why some

80:26

meditation apps as well have now started

80:29

to do what's called Sleep stories which

80:31

in some ways is what you're doing a

80:33

version of with your podcast

80:36

is Hawks back to when we were kids you

80:39

know for many parents they would just

80:41

read a book to the kid you know the

80:43

children's books good night books

80:45

because you would read the child to

80:47

sleep

80:48

and for some reason

80:51

we as we developed into adults we

80:53

thought well we no longer benefit from

80:56

having a story read to us to help our

80:57

sleep

80:58

no it's not true we we benefit hugely in

81:01

fact the the meditation company calm you

81:05

know was saved by the the introduction

81:07

of sleep stories into their app they

81:09

were doing pretty well as a meditation

81:10

app but then they started to do sleep

81:13

stories and it became a unicorn company

81:16

um in terms of its valuation it broke a

81:19

billion dollars and it was on the the

81:22

back of sleep stories and what they

81:24

realized is that people were

81:25

self-medicating their insomnia by way of

81:28

meditation so they latched on to that

81:30

and then they found that these stories

81:32

sleep stories were great and you've got

81:34

now wonderful people people who you've

81:36

interviewed on the show so what you're

81:39

doing and what those sleep stories are

81:40

doing and what meditation is doing it's

81:42

all the same thing which is that it is

81:45

taking your mind off itself

81:48

because when you are struggling to sleep

81:51

or you've woken up in the middle of the

81:53

night

81:54

what you don't want to be doing is

81:57

focusing on either what you what you

82:00

what did I do today what did I not do

82:02

today what did I do poorly oh my

82:04

goodness what have I still got to do

82:06

tomorrow and at that point things are

82:09

just a disaster you're Wide Awake

82:12

what all of the things that we've just

82:14

discussed do is they take your mind off

82:17

itself

82:18

and at that point then you start to

82:21

allow sleep to come back naturally

82:24

that's why one of the other suggestions

82:26

is take yourself for a mental walk so

82:29

don't count sheep by the way that

82:30

doesn't work if colleague of mine at UC

82:32

Berkeley did the study actually takes

82:34

you longer to fall asleep if you're

82:35

counting uh sheep what she found at Dr

82:38

Allison Harvey was that if you just

82:41

close your eyes and you think about a

82:43

walk that you take frequently let's say

82:44

it's a walk with the dog and you think

82:47

about it in High Fidelity detail so I

82:50

close my eyes I go out the door take a

82:52

left down the steps then I'm going to go

82:54

up the street I take the first left past

82:56

that pine tree that's the level of

82:58

detail if you just walk yourself on that

83:00

mental walk sure enough people fall

83:02

asleep in about 50 less time half the

83:05

time it takes this is the thing with

83:07

sleep stories and also my serial killer

83:09

documentaries or serial killer podcasts

83:11

that I listen to

83:12

detail exactly you get even I've

83:15

listened to

83:16

calms sleep stories before and the

83:19

attention to detail in the sort of

83:22

descriptive nature of what they're

83:22

saying is so apparent they'll say things

83:24

like the cold wet window sill saw the

83:28

raindrops like

83:31

um tapping against it one by one by one

83:34

by one and that sounds very similar to

83:36

my serial killer documentaries when I

83:38

hear about the serial killer coming in

83:39

through the window yeah yeah yeah at

83:41

night time

83:42

um and I wondered why the descriptive

83:44

nature of it the detail matters for

83:46

dozing us off and because it prevents I

83:49

mean you've got limited bandwidth in

83:50

terms of cognitive capacity right and if

83:52

you're consumed and you saturate your

83:54

bandwidth with that level of detail it's

83:57

very hard for any of these other things

83:59

called our worries and our anxieties to

84:02

start entering into our mind the other

84:04

thing I would note by the way though is

84:06

if you are if none of these things are

84:08

working for you if the fictional notion

84:11

of Serial killing is not working for you

84:13

if meditation is not working for you if

84:16

going on a mental walk is not working

84:18

for you

84:19

this is the final suggestion I have if

84:22

you're lying there awake firstly by the

84:24

way if you're struggling with sleep

84:25

remove all clock faces from your bedroom

84:27

to one of the best pieces of advice I

84:29

can give you

84:30

knowing what time of night it is is no

84:33

favor so knowing now that it's 3 23 am

84:38

in the morning and I'm still struggling

84:40

to fall asleep and then I look back at

84:42

the clock and it's now 403 am and I've

84:45

still been awake and now it's 4 27 and

84:47

I've got to wake up at 6 30 a.m knowing

84:50

that

84:51

has no utility for you remove all clock

84:55

faces from your bedroom it is a gift

84:58

but coming back to the final suggestion

85:00

if you don't want to get out of bed if

85:03

you don't want to listen to a podcast

85:05

the final thing I would say is just

85:07

accept and say look it's okay tonight is

85:10

not my night it is not the worst thing

85:13

in the world and instead of trying to

85:15

sleep

85:16

all I'm going to do here is lie in bed

85:19

and I'm just going to rest

85:22

because wouldn't it be lovely if someone

85:24

came to you in the middle of your work

85:25

day you're just stressed and someone

85:28

said by the way just come into this room

85:30

there's a bed here just lie down and

85:33

just rest for an hour wouldn't it be

85:36

lovely just have a good old rest for an

85:38

hour just rest there

85:41

and I would say that if you can't sleep

85:43

just lie in bed stop worrying about

85:45

sleep and not being able to get it stop

85:47

worrying about the next day just lie in

85:50

there and enjoy a nice good old rest

85:54

and by the way usually what happens is

85:56

that after you start thinking okay I'm

85:58

going to rest the next thing you

86:00

remember is the alarm clock going off at

86:02

6 30 because finally you stop trying and

86:04

sleep happens so of course you know

86:07

prolonged one of the things I've also I

86:09

wonder if this is a if I'm wrong about

86:11

this is I sometimes thought that you

86:14

know I could go Monday to Friday and

86:16

kind of sacrifice my sleep this was

86:17

specifically when I was really in the

86:19

height of like running big businesses

86:20

Etc

86:21

um and then on the weekend I'll just

86:22

make up for it

86:24

so I thought you know I could go Monday

86:25

to Friday I'll sleep maybe sometimes two

86:27

hours a night three hours a night

86:28

whatever then Saturday you know I'll

86:30

just do a you know 11 hour sleep and

86:32

I'll just make up for it yeah

86:36

is that a good strategy

86:39

the delightful laughter at the end of

86:41

your sentence that uh I think probably

86:44

tells you the answer that you know

86:46

um unfortunately sleep doesn't work like

86:49

that it would be nice if it did sleep is

86:52

not like the bank in other words you

86:54

can't accumulate a debt

86:56

as you were doing during the week and

86:58

then hope to try and pay it off at the

87:00

weekend

87:02

um so for example let me take an extreme

87:04

version of that experiment let me take

87:06

you tonight I'm going to deprive you of

87:08

sleep for an entire night for let's say

87:10

eight hours of sleep and then tomorrow

87:12

night I'm going to give you all of the

87:14

recovery sleep that you want as much as

87:16

you wish for and then the next night you

87:19

can have all of the recovery sleep that

87:21

you want and even on the third night

87:23

will you sleep longer that first

87:26

recovery night after a night of No Sleep

87:29

absolutely you will sleep longer

87:31

but across those three or four recovery

87:34

nights of sleep will you get back all of

87:36

the sleep that you lost not even close

87:38

you'll maybe only sleep back about four

87:40

four and a half of the eight hours that

87:43

you lost in other words by that stage

87:46

you are four or three and a half hours

87:48

in overdraft on your sleep bank account

87:51

you went into debt and you only paid

87:54

about 50 percent of it back so what's

87:57

happening with you during the week is

87:59

that you're accumulating this debt you

88:01

know of maybe 10 hours you should change

88:04

and you're only sleeping like six hours

88:05

a night for the five nights during the

88:07

week and then you binge on sleep and you

88:10

try to maybe sleep 10 hours or 11 hours

88:13

that's only two or three extra hours so

88:16

some total that's only four to six you

88:20

know hours of made up sleep

88:22

relative to the 10 hours of debt so what

88:25

happens is that that next week you now

88:27

carry forward four hours of your debt

88:31

and then next weekend you try to sleep

88:34

it back but you're still four hours lost

88:35

so now you've got eight hours of net

88:37

debt in other words what it develops is

88:40

into a compounding interest on a loan it

88:42

just starts to escalate ballistically

88:44

across weeks across years and across the

88:47

lifespan and then what happens in terms

88:49

of

88:50

Health outcomes so say that I did that

88:52

for a couple of years say that I

88:53

sustained that pattern of you know

88:55

depriving myself of sleep throughout the

88:56

week maybe catch up on Saturday yeah

88:58

depriving myself again the next week

89:00

catch up on Sunday deprive myself the

89:02

next week and I did that pattern for

89:04

multiple years what would be the health

89:07

implications so you can describe them

89:11

short mid and long term

89:13

the first thing I would say though is

89:15

that the elastic band of sleep

89:16

deprivation will stretch only so far

89:18

before it snaps

89:20

the short-term you know probably the

89:23

most immediate short-term consequence is

89:25

that you are popped out in a driving

89:27

related accident drowsy related accident

89:32

because drowsy related accidents are

89:35

non-trivial they make up a large

89:37

proportion of accidents on our streets

89:40

in terms of human errorful driving when

89:43

you say popped out

89:44

of the gene pool

89:46

okay so what happens is that when you

89:48

are under slept you're at the wheel and

89:50

you start to have what we call Micro

89:52

sleeps where your eyelid will partially

89:54

close now you are not aware of it you

89:57

have no awareness of it whatsoever and

89:59

in fact parts of your brain seem as

90:01

though they're almost falling asleep

90:02

like you're having this micro sleep and

90:04

it lasts for about a second or two

90:06

seconds now if you're on the motorway

90:08

and you're traveling at 70 miles an hour

90:10

and you have a two second micro sleep

90:13

that's enough time for you to drift from

90:15

one lane into the next if you're just in

90:17

a two on a two-lane you know sort of

90:21

back street where there's oncoming

90:23

traffic in the other direction and

90:25

you're traveling at 40 miles an hour and

90:27

you drift half the way into that lane

90:29

that's oncoming traffic so in other

90:33

words if you have a micro sleep at 60 or

90:35

70 miles an hour at that point there's a

90:38

two-ton missile traveling at 60 miles an

90:40

hour and no one's in control and that

90:43

may be the last micro sleep that you

90:44

ever have in your life

90:46

obviously all the other things you've

90:48

mentioned would be implications things

90:50

like performance drop sort of memory

90:52

relationships libido would all drop off

90:55

so I wouldn't be having as much sex I

90:56

would like all those things then midterm

90:58

so midterm then you're going to escalate

91:00

those things into more disease state so

91:02

for example if I were to take an

91:03

individual and uh people have done these

91:06

studies not not we but um where you

91:08

limit them to let's say four or five

91:09

hours of sleep for one week your levels

91:12

of blood sugar are disrupted so

91:15

significantly that your doctor at the

91:17

end of that one week would classify you

91:19

as being pre-diabetic

91:21

so that's you could almost argue that

91:23

short term not mid-term

91:26

um you know one if you're a male and I

91:29

limit you to four or five hours of sleep

91:31

a healthy young male

91:33

um for one week I will drop your levels

91:36

of testosterone to that of someone who

91:38

is 10 years older than you so I can age

91:40

you by a decade just by short sleeping

91:44

you for one week we see equivalent

91:46

impairments in female reproductive

91:48

Health in estrogen luteinizing hormone

91:50

and follicle stimulating hormone

91:53

um so it's both men and women

91:55

your blood pressure will start to creep

91:57

up your systolic blood pressure in

91:59

particular will creep up your heart rate

92:01

in terms of its contraction rate in

92:04

other words your speed of your heart

92:05

starts to increase the progression into

92:08

obesity diabetes

92:10

cardiovascular disease mental health

92:13

issues anxiety depression suicidality

92:17

all of these things immune compromise

92:19

infection

92:21

all of those things can be termed you

92:23

know will be midterm now all of those

92:25

things have a longer term tale to them

92:27

which is this thing called premature

92:29

mortality so using that sweet spot of

92:32

seven to nine hours of sleep you can

92:34

argue that there's a simple truth on the

92:36

basis of the data the shorter your sleep

92:38

the shorter your life that short sleep

92:40

will predict all-cause mortality is that

92:43

supported by the by data that's

92:45

supported by data now there's an

92:46

interesting change there which is once

92:49

you get past about 9 or 10 hours your

92:51

mortality risk doesn't just keep going

92:52

down and down it will hook back up again

92:55

as if almost too much sleep is a bad

92:58

thing and we can explain why that is the

93:00

case as well and why it's probably not

93:02

quite as simple as that but the final

93:05

long-term consequence that I would say

93:07

is Alzheimer's disease you know the two

93:09

most feared diseases in developed

93:10

nations are cancer and Alzheimer's

93:12

disease both of them have links to

93:14

insufficient sleep many of them causal

93:17

and this relationship between sleep and

93:19

Alzheimer's disease this is where we

93:20

actually do I'd probably say almost 50

93:23

of the work that I do at my sleep center

93:24

is focused on sleep and Alzheimer's

93:26

disease

93:27

and there the data is stunning I would

93:29

say at this stage insufficient sleep

93:32

seems to be one of the more or one of

93:36

the most significant lifestyle factors

93:39

that can develop or dictate the

93:43

development of Alzheimer's disease later

93:45

in life now that's a lifestyle Factor

93:46

there are other genetic factors but

93:49

certainly we now know that it's not just

93:51

that insufficient sleep

93:53

predicts a greater amount of Alzheimer's

93:57

pathology in your brain so for example

93:59

people who on average are sleeping six

94:00

hours or less have a far higher

94:03

magnitude of amyloid of beta amyloid

94:06

which is the sticky toxic protein

94:08

related to Alzheimer's disease and

94:09

another protein called Tau protein these

94:11

are the two protein culprits of

94:13

Alzheimer's both of those are escalate

94:16

the less and less sleep that you have

94:18

now that's just associational we also

94:20

know by the way that two Sleep Disorders

94:22

insomnia and sleep apnea heavy snoring

94:24

both of those are associated with a

94:27

marked increased risk of your

94:28

Alzheimer's disease of Alzheimer's

94:30

disease later in life that's simply

94:32

associational that doesn't prove

94:34

causality but we now have the causal

94:37

evidence both in animal models and in

94:39

human models if I deprive a human being

94:42

of sleep for a single night or I even

94:44

just deprive you of deep sleep for a

94:47

single night the next day we can see an

94:49

immediate increase in these Alzheimer's

94:51

disease related proteins circulating in

94:53

your bloodstream circulating in what we

94:56

call a cerebral spinal fluid that bathes

94:58

the brain and using special brain scans

95:00

we can even measure it within the brain

95:02

itself

95:04

so these are causal manipulations it's

95:06

not associational I manipulate this

95:08

thing called sleep and the consequence

95:10

is that I manipulate your Alzheimer's

95:12

disease proteins

95:13

that's correlation going to causation

95:16

then the question is well mechanism

95:20

what is it about sleep when you get it

95:22

that is de-escalating Alzheimer's

95:24

disease risk

95:25

in other words when you don't get it

95:28

what why would it increase your

95:30

Alzheimer's risk and this is a stunning

95:31

discovery made by a scientist called

95:33

Macon nedergaard at the University of

95:35

Rochester here in America and she found

95:38

three things first studying mice and

95:41

rats she found that the brain has a

95:44

cleansing system now we didn't used to

95:46

think that your brain had a cleansing

95:48

system your body had one and everyone

95:50

knows what it's called it's called the

95:52

lymphatic system

95:54

um we didn't think the brain had one but

95:56

she discovered that the brain has one

95:57

it's called the glymphatic system named

96:00

after these glial cells that make it up

96:03

the second thing that she discovered is

96:05

that that cleansing system within the

96:08

brain is not always switched on in high

96:10

flow volume across the 24-hour period it

96:13

was expressly during sleep and

96:15

particularly during deep non-rem sleep

96:17

when that sort of sewage system was

96:21

pushed into overdrive and washed away

96:24

all of this detritus that built up

96:26

during the day

96:27

and the final thing that she discovered

96:30

and this is why it's related to

96:31

Alzheimer's disease is that two of the

96:33

metabolic byproducts that build up

96:35

during the day in our brain

96:37

are beta amyloid and Tau protein

96:40

the two Bad actors in Alzheimer's

96:43

disease so in other words what she

96:45

discovered is a system of you know good

96:47

night sleep clean that sleep is a power

96:50

cleanse for the brain

96:52

and if you're not getting your sleep

96:53

every night you know it doesn't mean

96:56

that you're going to get Alzheimer's

96:57

disease next week it doesn't mean that

96:58

you're going to get Alzheimer's disease

96:59

you know in a year's time

97:01

but night after night once again it's

97:04

like compounding interest on a loan and

97:07

that's why we now believe through this

97:08

causal mechanism that insufficient sleep

97:11

is a risk factor for Alzheimer's disease

97:13

lots of people will say to me look there

97:15

are these individuals in society who

97:18

claim that they you know didn't need

97:20

very much sleep who didn't sleep a lot

97:23

you know Margaret Thatcher has often

97:24

quoted me uh quoted to me about that you

97:27

know

97:28

um

97:29

uh Ronald Reagan was apparently another

97:31

short sleeper

97:33

I don't think it's coincidental that

97:36

both Thatcher and Reagan went on to die

97:39

of the unfortunate disease of

97:42

Alzheimer's

97:45

I'm sold

97:47

sleep is important I get it I'm sold

97:51

how do I

97:53

my question is what are the things that

97:56

in the modern society are standing in

97:58

the way of sleep we've touched on some

98:00

of them Loosely but some of the like big

98:01

obvious things the things that you would

98:04

suggest doing very actionable things we

98:06

could do straight away to improve our

98:08

chances of having that healthy

98:10

um deep sleep that we need to be um

98:13

optimal in every regard of our health

98:15

and performance

98:16

there's probably I think five standard

98:19

tips what we call sort of sleep hygiene

98:21

that you can do and then I'll come on to

98:23

maybe just some unconventional tips that

98:25

we've sort of touched on and we've

98:27

spoken about many of these the first

98:29

thing I would recommend people to do and

98:31

this is why when some people say how

98:33

what about this new sleep supplement or

98:34

you know it's it's 40 quid for this

98:37

bottle of these the new sleep natural

98:39

medication so I'm going to give it a try

98:41

I would say try these tried and true

98:44

things first before you spend your money

98:46

on supplements the first thing is

98:47

regularity go to bed at the same time

98:50

and wake up at the same time no matter

98:52

whether it's the weekday or the weekend

98:54

your brain expects regularity it thrives

98:57

best in the conditions of regularity

98:59

when you give it regularity you can

99:02

improve the quantity and the quantity of

99:04

your sleep the second thing is get some

99:07

Darkness at night as I said we don't get

99:09

enough darkness in the modern world

99:12

and so the trick I would offer and I

99:15

don't use it I don't like the word hack

99:17

but the suggestion would be in the last

99:19

hour before bed

99:21

try this experiment for everyone

99:23

listening for the next week

99:26

dim down half of the lights or switch

99:28

off half of lights or even three

99:31

quarters of the lights in your home in

99:33

the last hour before bed all of the

99:36

lights in every room in all of the rooms

99:38

you know switch off almost all of the

99:40

light now I'm not suggesting be unsafe

99:42

and walk around in the darkness in the

99:44

last hour that's not everyone's saying

99:45

just dimmed out you know switch off half

99:47

of the lights

99:48

you will be surprised at how sleepy that

99:52

Darkness will make you feel and it's

99:54

also an incredible behavioral trigger

99:58

to signal to your brain that it is time

100:03

for sleep that darkness is around me

100:06

that's the second tip is Darkness the

100:08

third tip is temperature

100:11

most people sleep in an ambient bedroom

100:13

temperature that is too high

100:15

and you need to aim for bedroom

100:17

temperature of about 18 18 and a half

100:20

degrees Celsius around about 65 to 68

100:23

degrees Fahrenheit if I'm probably

100:25

butchering the the mathematics there on

100:27

that but

100:29

um you need to get cool now you can wear

100:31

thick socks you can have a hot water

100:33

bottle that's fine but the ambient needs

100:36

to be cold

100:37

because you need to drop your core body

100:39

temperature and your brain temperature

100:41

by about one degree Celsius to fall

100:43

asleep and stay asleep

100:44

and it's the reason that you will always

100:46

find it easier to fall asleep in a room

100:48

that's too cold than too hot so make

100:51

your bedroom cold make it dark like a

100:53

cave

100:54

that the fourth question would be sort

100:58

of what we've or fourth suggestion would

101:00

be Walk It Out and we've spoken about

101:03

this the 30-minute rule you know get up

101:05

do something different or meditate you

101:08

know don't lie in bed awake for too long

101:09

then the final two things we've spoken

101:11

about well we've spoken about caffeine

101:14

we haven't spoken about alcohol but let

101:16

me just say as the kind of headline of

101:18

it alcohol is not a sleep aid many

101:20

people use it as a sleep aid it is not

101:23

your friend alcohol again is a sedative

101:25

so it knocks you out the second is that

101:28

it fragments your sleep so you wake up

101:30

your sleep is littered with all of these

101:32

small Awakenings most of them you don't

101:34

remember because there's too brief but

101:36

it makes for miserable lousy quality

101:39

sleep and the final thing is that

101:40

alcohol is very good at blocking your

101:42

REM sleep or your dream sleep which we

101:43

know is critical for many other

101:45

functions as well so alcohol's not your

101:47

friend that's the sort of the final tip

101:49

again you know just every if you're with

101:52

friends have a glass of red wine just

101:55

know okay my sleep's not going to be

101:57

great thank you

101:59

I'm joking you know I'm not yeah

102:03

it's just you know live life too of

102:05

course I'm not saying that I I was I was

102:07

thinking there about the other sort of

102:09

Behavioral things that we do that harm

102:11

our sleep as well we talked about coffee

102:13

earlier on avoiding that weird that

102:14

people drink it after dessert in the

102:16

evening so yeah never understood that

102:18

because that's an old tradition

102:20

um but the other thing obviously that

102:21

the modern generation are even more

102:22

susceptible to is to

102:24

have a quick tick tock

102:26

the social media account or something

102:28

now I thought you know there's a lot of

102:31

different products out there that are

102:32

trying to help with the the light that

102:34

comes from these screens that I think is

102:36

the cause of what's keeping us awake but

102:38

there's this little button called Dark

102:40

mode on my iPad there's also one called

102:42

night shift so if I just pop that on

102:45

Bob's your uncle and I can crack on with

102:49

my screen time

102:50

true or false

102:53

partly true oh good okay so I can just

102:56

pop that on night mode in dark mode and

102:58

then I can carry on using my iPad

103:00

partly true

103:02

so it turns out that the blue light from

103:05

screens does have an impact on sleep so

103:08

there's a great City done by Harvard

103:09

Medical School by some colleagues there

103:10

and they showed that reading for an hour

103:13

on an iPad just before bed relative to

103:17

just reading a book in dim light firstly

103:19

it delayed the time with which people

103:22

fell asleep so it took them a lot longer

103:24

to fall asleep second it reduced the

103:26

total amount of sleep that they had

103:28

third it decreased a sleep-related

103:30

hormone called melatonin it delayed the

103:33

release of that melatonin and it reduced

103:35

the amount of melatonin and finally it

103:37

reduced the amount of rapid eye movement

103:39

sleep so it had significantly

103:41

significant the Melatonin Point

103:42

significantly so it delayed the release

103:45

by about somewhere between 90 minutes to

103:47

two hours across the individuals so in

103:49

other words your brain wasn't so what

103:51

melatonin does it's a it's called the

103:54

hormone of Darkness or the vampire

103:55

hormone just because not be because it

103:59

makes you want to bite into being next

104:00

because it signals to your brain that

104:03

it's night time that it's Darkness and

104:06

so your brain needs the signal of

104:08

melatonin for it to understand when is

104:10

it dark in other words it needs to

104:12

understand by way of melatonin when it

104:14

is time to fall asleep and when you're

104:16

bathed in electric light at night and

104:18

especially when you're getting blue

104:20

light from these devices your brain is

104:22

fooled into thinking it's still daytime

104:24

and when there is light emitting through

104:27

your retina coming into your brain it

104:30

signals to a part of your brain to hit

104:32

the brakes on melatonin and your brain

104:34

will not release melatonin so what was

104:37

happening with this iPad reading is that

104:39

you are artificially telling the brain

104:40

it's still daytime and the brakes on

104:43

melatonin were still shut on and so

104:45

melatonin was not starting to be

104:47

released until much later

104:49

and what was it also interesting about

104:51

the study by the way is that when they

104:53

stopped the iPad reading the Sleep

104:55

disrupted pattern continued for several

104:57

days later in other words it was almost

104:59

like a drug that it had a washout period

105:01

that was a blast radius to it now

105:04

there's been some great work by a

105:06

wonderful sleep scientist in Australia

105:08

Michael gradazar and he is added to this

105:12

story and he said it's not just the blue

105:14

light these devices the principal

105:17

function of these devices is that they

105:19

are attention capture devices just like

105:21

you said I'm just going to have a wee

105:23

little Tick Tock before bed

105:25

they are in the attention economy and

105:30

all they care about is capturing your

105:31

attention for current currency and they

105:33

make a lot of money from it

105:35

what that attention does is that it

105:37

stimulates your brain and when your

105:39

brain is stimulated it's very difficult

105:41

for you to fall asleep and it creates

105:43

what we call Sleep procrastination where

105:45

you're lying in bed and you could be

105:47

perfectly sleepy and you could fall

105:49

asleep right now

105:51

but then you sort of check social media

105:53

and they think oh I'll just shoot that

105:54

last email and then I'll order that last

105:57

thing on sort of you know Amazon and

105:59

then you get a text back from your

106:01

friend and you start texting them and

106:03

and then you look up and it's now an

106:05

hour later and you're an hour deficient

106:07

on sleep so it's the activation of your

106:10

cerebral cortex by these devices that is

106:12

perhaps the more harmful aspect of them

106:15

regarding your sleep now

106:18

here again I don't want to be finger

106:20

wagging you know the genie of technology

106:23

is out the bottle and it's not going

106:25

back in any time soon there's nothing

106:27

that I'm going to say as a sleep

106:28

researcher that's going to change that I

106:30

don't take my phone into my bedroom

106:33

I put my phone uh out in the kitchen I

106:36

don't see it until morning but lots of

106:39

people do and fair enough but there's

106:42

another rule uh that I've stolen from

106:43

another friend called Michael grandner

106:45

who's uh here in America at the

106:47

University

106:49

um of Tucson in Arizona he has this

106:52

Great rule regarding technology and it's

106:53

the following that if you really must

106:55

take your phone into your bedroom

106:57

you can only use it

107:00

standing up

107:02

and what you'll find is that after about

107:04

six or seven minutes standing up you

107:06

think I'm just gonna I'm just gonna sit

107:08

down on the bed and at that point as

107:10

soon as your backside hits the bed

107:11

you're done you've got to put the phone

107:13

away I think it's a great rule of thumb

107:14

if uh if you need to take technology in

107:16

the bedroom

107:17

um I'm going to apply that the other

107:19

thing I wanted to ask was about sleep

107:21

and weight loss had a lot of Health

107:24

experts on this podcast recently but

107:25

none of them have really talked to me

107:26

about the role that sleep or sleep

107:28

deprivation plays in

107:31

wait

107:33

is there a relationship

107:35

it's probably one of the most well

107:38

defined relationships that we know in

107:40

all of sleep science

107:42

and it is at least a three-part story so

107:47

the first emerging evidence came in

107:49

terms of hormones so there are what we

107:52

call appetite regulating hormones and

107:55

the two principal ones of concern here

107:57

are something called leptin and ghrelin

108:00

now leptin when it's released will

108:03

signal to your brain that you're

108:05

satisfied with your food you are

108:07

satiated and you are no longer hungry

108:11

Lin does the opposite when ghrelin is

108:14

released it says no you're not satisfied

108:17

with your food you are not full you

108:20

still want to eat more you are still

108:22

hungry

108:23

and some of the first studies they

108:25

started to just limit people restrict

108:27

people's sleep to six hours or five

108:29

hours or four hours and what they found

108:32

was that um there was

108:34

firstly that signal leapt in that says

108:37

no you're satisfied with your food you

108:39

don't want to eat anymore you're full

108:42

that signal of fullness satiation was

108:45

decreased by 18 percent

108:48

if that wasn't bad enough ghrelin which

108:51

is the hunger hormone that lapped up by

108:54

28 percent

108:58

overall hunger levels Rose by about at

109:01

26 percent

109:03

so firstly you are it's almost like

109:06

double jeopardy that you are getting

109:09

punished twice for the same crime of not

109:11

sleeping enough once by losing the

109:14

signal of I'm full

109:16

I I don't want to eat anymore and once

109:18

again for the no I'm much more hungry

109:21

and I'm just going to overeat which is

109:23

ghrelin

109:25

so what that produces is a profile of

109:29

increased eating so on average

109:31

underslept individuals started to eat in

109:33

those studies about three to four

109:36

hundred extra calories at each sister at

109:40

each sitting by way of insufficient

109:42

sleep

109:44

then what they discovered is that it's

109:46

not just that you want to eat more it's

109:49

what it is that you have a craving for

109:51

when you are under slept

109:53

and this is the problem what they found

109:55

is that when you are under slept you eat

109:57

more of everything but you especially

109:59

eat more of these heavy-hitting stodgy

110:02

carbohydrates bread pasta pizza

110:06

the the next thing that you started to

110:08

eat have a preference for was simple

110:10

sugary Foods sweets and chocolate and

110:14

then finally you started to Crave very

110:15

salty food and high sodium food intake

110:18

will increase your blood pressure

110:21

so that was the first of the the three

110:24

mechanisms then we did a study where we

110:27

said perhaps it's not just the

110:29

circulating hormones in the body the

110:31

brain is the ultimate Arbiter of your

110:34

food decisions so what's going on in the

110:36

brain so we took a group of perfectly

110:37

healthy individuals and we put them

110:39

through the experiment twice once when

110:42

they'd had a full eight hours of sleep

110:43

and once when we deprived them of sleep

110:45

and the next day we place them inside an

110:47

MRI scanner and we showed them images of

110:50

lots of different foods that range from

110:52

being sort of you know very healthy to

110:54

being very unhealthy and sort of ice

110:56

cream and you know chocolate and pizza

110:59

and things to Leafy salads and nuts and

111:03

greens and vegetables and we asked them

111:06

to rate how much they wanted that food

111:08

for each item now we did something a bit

111:10

just sort of dastardly to make it more

111:13

ecologically correct so that they

111:15

weren't just saying okay they probably

111:16

think I should probably say that's

111:18

healthy we said we're going to randomly

111:20

select one of these image which is these

111:22

food images that you see and after you

111:24

get out the brain scanner we're going to

111:25

give you that food and we're going to

111:26

politely ask you to eat it all so it

111:29

made it a bit more realistic so the

111:30

choices were more you know as much as

111:32

that we could

111:33

so what we found is that when they were

111:35

sleep deprived the Deep hedonic centers

111:39

the emotional centers of the brain these

111:42

desire centers these reward centers they

111:46

ramped up in their activity in response

111:48

to these highly desirable highly

111:50

unhealthy Foods

111:52

so these more basic sort of you know

111:54

guttural parts of the brain as it were

111:57

these reward centers were lighting up

112:00

much more strongly when you're sleep

112:02

deprived worse still the impulse control

112:05

regions in the front of the brain what

112:07

we call the prefrontal cortex they were

112:09

shut down they were taken offline so as

112:11

a consequence you lost your impulse

112:13

control and that's why you start to then

112:15

say you know when I'm sleep deprived at

112:18

the food sort of buffet I'm not I'm not

112:21

going to do salad I'm just gonna that

112:24

pizza looks awful good or that pasta

112:26

with the cream I'm just gonna go into

112:28

that all go so

112:30

so you're it's what we call a pattern in

112:33

terms of brain activity in Neuroscience

112:35

of hedonic eating that your brain goes

112:38

into this hedonic desire profile so now

112:41

we understood it's not just hormones in

112:42

the body it's also changes in the brain

112:45

then came the finding that there's

112:47

another chemical in the body that's

112:49

responsible

112:51

and this comes on to cannabis

112:55

when people

112:57

um

112:58

when people when people that you may

113:00

know have smoked uh cannabis they'll

113:03

often say I get

113:04

viciously hungry I get the munchies I

113:06

get really hungry that's no coincidence

113:08

because cannabis will stimulate appetite

113:12

now we all have naturally occurring

113:15

cannabis compounds in our brain and our

113:18

bodies they are called

113:20

endocannabinoids Endo meaning comes from

113:23

insiders

113:25

whereas the Cannabis that comes

113:27

externally when you sort of smoke it or

113:29

take edibles

113:31

so

113:33

endocannabinoids do many things for the

113:35

brain and the body but one of the things

113:37

that they do is control your appetite

113:39

and your hunger and what we found is

113:40

that when you sleep deprived individuals

113:42

these naturally occurring

113:44

endocannabinoids rocketed up by over 20

113:47

percent

113:49

cranking up people's appetite

113:52

and so these three ways lead you to stop

113:56

hacking on you know when insufficient

113:59

sleep is occurring when sleep gets short

114:01

your waistline typically starts to

114:03

expand and we Now understand the reasons

114:06

if that wasn't bad enough

114:13

the last thing that we discovered is

114:16

that

114:16

let's say that you're trying to be

114:18

really careful and you're trying to diet

114:19

and you're trying to lose weight

114:22

if you're not getting sufficient sleep

114:24

then 60 of all of the weight that you

114:28

lose will come from lean muscle mass oh

114:32

God and not fat not the muscle I know

114:35

exactly so in other words when you are

114:38

dieting but you are under slept you lose

114:41

what you want to keep which is muscle

114:44

and you keep what you want to lose

114:46

just fat

114:48

so again it's I'm sold not an ideal

114:52

situation my last question for you in

114:54

fact was of all the subject matter we've

114:57

talked about

114:58

what is the most interesting thing we've

114:59

missed in your view the thing that you

115:02

think is most pertinent or interesting

115:03

or significant or perks people up or

115:06

sits them on the end of their chair when

115:07

you discuss it

115:11

I think the only other area that

115:14

fascinates people even more than sleep

115:18

is dreaming hmm

115:20

so dreaming above and beyond the stage

115:24

of which it comes from which is

115:25

principally called rapid eye movements

115:27

they put dream sleep REM sleep provides

115:30

a set of physiological and uh benefits

115:33

but dreaming we've now discovered even

115:36

above and beyond that provides benefits

115:38

and it provides at least two benefits

115:40

the first is creativity I was telling

115:42

you that during deep sleep you cement

115:44

individual memories you grab memories

115:46

and you shift them from a short-term

115:48

storage Reservoir to a long-term storage

115:50

Reservoir and you strengthen the circuit

115:52

of those memories so you future proof

115:54

information but that's individual

115:56

memories what we discovered is that

115:58

sleep is much more intelligent than you

116:00

ever thought possible that it's during

116:03

REM sleep and particularly during

116:04

dreaming that we take all of the

116:07

individual pieces of information that

116:09

we've been learning and we start

116:10

interconnecting them and associating

116:12

them with all of our back catalog of

116:15

stored information

116:16

and so what dreams the one of the

116:19

functions of dream sleep is to

116:21

cross-link and Associate new memories

116:24

together so you wake up the next day

116:26

having After Dream sleep with a revised

116:29

mind web of associations and those are

116:33

capable of divining solutions to

116:35

previously impenetrable problems

116:37

so think of dreaming as it's almost like

116:41

informational alchemy that you start to

116:44

fuse things together that shouldn't

116:45

normally go together

116:47

but when they do they cause marked

116:49

advances in your thinking in your

116:51

productivity in your Ingenuity and in

116:54

that way you go to sleep with the pieces

116:56

of the jigsaw

116:58

but you wake up with the puzzle complete

117:00

and I would argue that that's the

117:02

difference between knowledge which is

117:04

remembering the individual pieces

117:07

and wisdom which is knowing what it all

117:11

means when you fit them together that's

117:13

one of the functions of dreaming it's

117:14

the Reason by the way that you've never

117:16

been told to stay awake on a problem

117:17

yeah

117:19

um the other function of dreaming that

117:23

we know of is that dreaming provides a

117:25

form of emotional first aid

117:28

that we've we've done a lot of work and

117:30

we came up with a theory that was called

117:32

Dreaming as overnight therapy

117:35

and what we've discovered is that when

117:37

we go into dream sleep particularly

117:39

based on its neurochemical profile and

117:41

its physiological anatomy of the brain

117:44

um the dreaming brain will take

117:46

difficult painful experiences sometimes

117:48

traumatic experiences and it will

117:50

essentially strip away the bitter

117:53

emotional rind from the informational

117:55

orange so let's take a step back what

117:57

makes a memory emotional what makes a

118:00

memory emotional is that at the time of

118:02

the experience that experience triggered

118:04

a strong visceral reaction and that

118:06

visceral reaction is useful to the brain

118:08

and it wraps that experience in this

118:11

blanket of what we call emotion it red

118:13

flags it and prioritizes it in the brain

118:15

so now you've created a memory of an

118:18

emotional event in other words you've

118:19

created an emotional memory

118:22

but what dream sleep does is then it

118:25

takes that useful emotional memory and

118:28

it will Detox the emotion from the

118:30

memory it strips the bitter emotional

118:33

rind from the informational Orange it's

118:36

almost and that's why we called it

118:39

overnight therapy so that the next day

118:41

you come back and now you feel better

118:43

about those experiences so you have a

118:47

memory of an emotional event but is no

118:50

longer emotional itself you don't

118:52

regurgitate that same visceral reaction

118:54

that you had at the time of learning so

118:57

the brain has done this elegant trick of

119:00

stripping the emotion from the memory

119:02

so it's that's this that's the second

119:05

benefit

119:06

um is that it provides

119:08

it's not time that heals all wounds it

119:11

is time during sleep and particularly

119:13

during dream sleep that provides

119:15

emotional convalescence it's funny

119:17

because there's a stereotype that we

119:19

should never go to bed angry at each

119:20

other

119:21

you will wake up far less angry as a

119:24

consequence

119:26

Matt we have a closing tradition on this

119:28

podcast where the last guest asks a

119:29

question for the next guest not knowing

119:31

who they're gonna ask it for

119:32

um the question that's been left for you

119:33

from our previous guest obviously they

119:35

didn't know who they're leaving it for

119:36

but uh it's a very I love these

119:37

questions when they're challenging

119:39

um

119:40

what is the biggest way in which you are

119:42

a contradiction

119:46

a gosh I'm a contradiction

119:48

in so many ways I think

119:52

I'm a contradiction in the sense that

119:54

within my profession with this field of

119:57

sleep I feel very comfortable I'm

120:00

reticent to say confident but I am very

120:03

comfortable to get on stage you know

120:05

give a TED talk in front of a couple of

120:07

thousand people and my heart rate will

120:09

be very stable I probably

120:13

I probably don't feel I feel more myself

120:18

on stage alone in front of thousands of

120:21

people

120:21

than I do at any other time in my life

120:24

that's where I feel most myself

120:26

but yet I'm a contradiction because off

120:30

stage

120:31

I'm very insecure

120:33

I am very much an introvert I'm very shy

120:39

um I don't like being the focus of

120:41

attention

120:42

and so those two things I've often

120:44

wrestled with but the more people I've

120:46

spoken to sort of now being out in the

120:48

public sphere and sort of

120:50

sort of being more in this sort of

120:51

public intellectual realm you start to

120:53

meet you know very famous people and you

120:57

meet you know musicians and

120:59

and what you learn is that they're very

121:01

similar that they say that they become

121:03

this version of themselves on stage and

121:06

then when they're off stage they are a

121:09

radically different person but I am such

121:10

a contradiction in that sense I feel

121:13

very comfortable and very secure on

121:17

stage in front of thousands of people

121:19

and for many people public speaking is

121:21

one of the most anxiogenic things you

121:24

can ask anyone to do but for me heart

121:27

rate is probably in the you know mid 40s

121:30

uh very relaxing for me but then put me

121:35

in a room in a small room of a couple of

121:36

people my heart rate's probably through

121:37

the roof and I've become very

121:39

introverted so I'm a contradiction in

121:40

that sense

121:42

um

121:43

yeah

121:45

Matthew thank you thank you for making

121:47

the time today I've I've wanted to speak

121:50

to you for many many years and you

121:52

absolutely never disappoint anybody so

121:53

you're it's really kind of you to say

121:55

it's exceptionally important work and as

121:57

you said at the start of this

121:57

conversation we often neglect the

122:00

medicinal properties of a great night's

122:02

sleep over things like diet and medicine

122:04

or exercise whatever whatever else it is

122:07

but your your voice and the the passion

122:09

that sits behind it has led a a charge

122:12

in society which is waking us up no pun

122:14

intended to the um the virtues and the

122:18

power and the importance of having a

122:20

great night's sleep but in a nice way in

122:22

a way that I find a really empowering

122:23

and actionable and that's the most

122:24

important thing so thank you for that

122:25

Matthew thank you and thank you for

122:27

saying that last part especially I I

122:29

don't think I can

122:31

um lay claim to that sort of early on I

122:34

think I'm doing much better as much

122:36

better I'm doing a little bit better as

122:37

a public communicator and being less

122:39

puritanical and dictatorial in my sleep

122:41

message I think it did a terrible job

122:43

coming out I'm learning and I'm being

122:45

more sensitive but I'm always lovely to

122:48

hear feedback from folks about what I'm

122:49

not doing well because I would love to

122:51

do this better and better if I can but

122:54

thank you for saying those kind words

122:55

and thank you again for having me on

122:57

giving me this opportunity to speak I

123:00

now will anoint you as a sleep

123:01

ambassador from this point forward so

123:04

thank you so much again Stephen thank

123:06

you so much

123:07

[Music]

123:09

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123:12

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camaraderie is tangible and you don't

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don't get that often when you're sat in

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your bed on your laptop there's

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know I never really usually pick the

124:25

chocolate flavored heels my favorite are

124:27

the banana flavor I love The Salted

124:29

Caramel flavor but recently I think I in

124:33

part blame Jack in my team who's

124:35

obsessed with the chocolate flavor heals

124:37

I've started drinking the chocolate

124:38

flavor heels for the first time and I

124:39

absolutely love them my life means that

124:42

I sometimes disregard my diet and it's

124:44

funny that's part of the reason why I've

124:45

had a lot of guests on this podcast

124:46

recently that talk about diet and health

124:48

and those kinds of things because I am

124:50

trying to make an active effort to be

124:52

more healthy to lose a little bit of

124:53

weight as well but to be more healthy

124:54

and the role that he'll plays in my life

124:56

is it means that in those moments where

124:59

sometimes I might reach for

125:01

you know junk Foods

125:04

having an option that is nutritionally

125:06

complete that is high in fiber that is

125:08

incredibly high in protein that has all

125:09

the vitamins and minerals that my body

125:11

needs within Arm's Reach that I can

125:13

consume on the go is where he always

125:15

been a game changer for me

125:16

[Music]

125:33

foreign

125:33

[Music]

Interactive Summary

This podcast episode features neuroscientist Matthew Walker discussing the critical role of sleep in physical and mental health. Walker explains why sleep is an essential 'elixir of life' that benefits immune function, memory, emotional stability, and toxin clearance in the brain. He addresses misconceptions about caffeine and alcohol, explains how to handle sleeplessness through techniques like CBT-I and meditation, and clarifies that 'sleep debt' cannot be simply recovered on weekends. The conversation also explores the impact of lifestyle choices, including diet and technology, on sleep quality.

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