A walk through the stages of sleep | Sleeping with Science, a TED series

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  • Опубліковано 15 чер 2024
  • Did you know you go on a journey every night after you close your eyes? Sleep scientist Matt Walker breaks down the difference between REM (Rapid-Eye Movement) and non-REM sleep, what occurs during each stage of sleep -- and why it's important to get enough of both.
    Sleeping with Science, a TED series, uncovers the facts and secrets behind our nightly slumber. Check out more episodes on TED.com: go.ted.com/sleepingwithscience

КОМЕНТАРІ • 345

  • @WoM
    @WoM 3 роки тому +789

    Sleep Norris

  • @orhunyeldan9800
    @orhunyeldan9800 3 роки тому +251

    From the constant smile on this dude's face, I can say that he sleeps well.

    • @Kube_Dog
      @Kube_Dog 3 місяці тому +1

      Or perhaps he's shooting a UA-cam video.

  • @CoreenMontagna
    @CoreenMontagna 3 роки тому +308

    When I take a nap, I always tell people “I need to go consolidate memories.”

  • @bhavindhedhi
    @bhavindhedhi 3 роки тому +499

    I just cant start to think how good of a sleep this guy must be getting each day!!

    • @marianapadillarincon2342
      @marianapadillarincon2342 3 роки тому +12

      I was thinking exactly the same before I read this comment🤣

    • @matthewbyron9454
      @matthewbyron9454 3 роки тому +10

      I know right. Everyone can benefit from proper rest.

    • @caprice5841
      @caprice5841 Рік тому +7

      he actually said in an interview worse that mostly he sleeps well but sometimes since his life is centred around the study of sleep, it can be difficult not to overthink it, hence, a lack of sleep

    • @thienthien7765
      @thienthien7765 Рік тому +2

      Having knowledge at something does not mean you can actually practice it in real life. But he’s a sleep expert, so….

    • @viq234
      @viq234 Рік тому +1

      Yeah, he also said that he had to overcome 2 serious bouts of insomnia in the past.

  • @StartupFundingEventGlobal
    @StartupFundingEventGlobal 3 роки тому +183

    "It's during REM sleep that we receive almost a form of emotional first aid" (love this part!)

    • @FabstaPizza
      @FabstaPizza 3 роки тому +5

      how come when i have a dream and i wake up, i see my surroundings but i see a little portal of my dream floating, and if i stare at it i will get sucked into that dream again?

    • @mrsssmlllaie4402
      @mrsssmlllaie4402 2 роки тому +5

      Well that explains why I'm an emotional wreck all the time. No rem sleep for me 😭

    • @silence-humility-calmness
      @silence-humility-calmness Рік тому +1

      ​@@FabstaPizza fascinating, never heard of such a phenomenon

    • @FabstaPizza
      @FabstaPizza Рік тому +2

      @@silence-humility-calmness Yeah, it's really weird, often times that dream is a nightmare so I avoid looking at it. Is it normal to see someone at the side of ur bed when u wake up too? It was a demon just standing there watching me sleep, scared the he'll out of me. But IDK if that's normal...

    • @Lenergyiskey358
      @Lenergyiskey358 7 місяців тому

      ​@@FabstaPizzasleep studes don't factor in the spiritual. Robert Monroe and other OBE researchers explain things like what you mention.

  • @daniaflores8013
    @daniaflores8013 3 роки тому +216

    I love this narrator. His voice is very clear and he seems interested in the topic

    • @yassin4173
      @yassin4173 3 роки тому +6

      I agree. It makes me want to relax and have agood sleep.

    • @whocares5584
      @whocares5584 3 роки тому +6

      Yeah and he's cute also

    • @daniaflores8013
      @daniaflores8013 3 роки тому

      VS his accent tho 😊

    • @Sam-uo5kl
      @Sam-uo5kl 3 роки тому +2

      Researched on this for his Doctorate thesis..

    • @matthewbyron9454
      @matthewbyron9454 3 роки тому +1

      What he did was wrong, I mean those graphics thats what things look like when your brain is melting. 2:00 She could have avoided that red bubble. And thats not how dreams work, the red bubbles are much smaller and they dont vibrate when everyone is talking at once after you've taken that windy noodle path. They should not have done that. Lol

  • @JadeTrading
    @JadeTrading 3 роки тому +237

    Who else just love TED's animations?😍

    • @deepakbhutani6977
      @deepakbhutani6977 3 роки тому +5

      I liked the animations, by the way you wrote the same comment in previous video also, isn't it

    • @sundayerhun
      @sundayerhun 3 роки тому

      Amazing

    • @matthewbyron9454
      @matthewbyron9454 3 роки тому +2

      What they did with that person trying to walk through those hallways or windows was wrong. Thats not fair to your brain. 2:00 You are not allowed to just stick to and then ride on a red bubble in your mind. There not for transportation loading and unloading your cares, she abused the red bubble system. 0:55 Its her own fault, she left this planet once she took those stairs off her mind.

    • @sa.m199
      @sa.m199 3 роки тому

      me

    • @mrabhiyaar
      @mrabhiyaar 2 роки тому

      @@matthewbyron9454 chhu 👍

  • @leonorrivera6379
    @leonorrivera6379 3 роки тому +32

    I’m watching this at 4:41 am and sleep fairy has been elusive to me.

  • @QuestionEverythingButWHY
    @QuestionEverythingButWHY 3 роки тому +217

    “The best bridge between despair and hope is a good night’s sleep.”
    ― Matthew Walker, Why We Sleep

    • @segmentsAndCurves
      @segmentsAndCurves 3 роки тому +1

      @Purva P But whenever I'm trying to sleep, I get depressed (existential crisis). And yeah I sleep a lot.

    • @ChritterB-pm5ww
      @ChritterB-pm5ww 3 роки тому

      She was on a seriously BAD TRIP ‼️💯‼️

    • @FabstaPizza
      @FabstaPizza 3 роки тому +3

      how come when i have a dream and i wake up, i see my surroundings but i see a little portal of my dream floating, and if i stare at it i will get sucked into that dream again?

    • @segmentsAndCurves
      @segmentsAndCurves 3 роки тому

      @@FabstaPizza Maybe you accidentally remind the brain that we haven't wake up and the brain just continues to sleep.

    • @segmentsAndCurves
      @segmentsAndCurves 3 роки тому

      @@FabstaPizza It happens to me all the time.

  • @QuestionEverythingButWHY
    @QuestionEverythingButWHY 3 роки тому +145

    “Each night, when I go to sleep, I die. And the next morning, when I wake up, I am reborn.”
    ― Mahatma Gandhi

    • @Melesniannon
      @Melesniannon 3 роки тому +2

      Are you sure that wasn't Mark Twain? ;-)

    • @amogh5427
      @amogh5427 3 роки тому +2

      It’s Buddha

    • @ChritterB-pm5ww
      @ChritterB-pm5ww 3 роки тому

      ...I thought anybody could repent and Be Born Again! ‼️💯‼️
      ‼️🤪‼️💥‼️

    • @kamranhussain1383
      @kamranhussain1383 3 роки тому +1

      yah it was me...

  • @salammeanspeace.
    @salammeanspeace. 2 роки тому +49

    Wish our teachers could teach us so simply just like him

    • @doorsareforopening
      @doorsareforopening 4 місяці тому +1

      Voluntary education on youtube is always more effective than involuntary education, because you actually sought out the knowledge

  • @AVLJunio
    @AVLJunio 3 роки тому +8

    I AM LOVING THESE VIDEOS ABOUT SLEEPING!!! Plz, continue.
    You are awesome!

  • @aminuh
    @aminuh Рік тому +3

    such beautiful animation and mr walker explains everything so clearly and calm..

  • @faithnlove
    @faithnlove Місяць тому +1

    Wow! I love this narrator! He is very good at explaning! He's an awsome dude!

  • @ramez2207
    @ramez2207 3 роки тому +2

    I've been researching this for long, thank you!

  • @blueeyes6852
    @blueeyes6852 3 роки тому +3

    Nice presentation from a good narrator! Real fascinating stuff! Thank you!

  • @twitchster77
    @twitchster77 8 місяців тому +4

    I screwed my shoulder up somehow last week. Man it hurt. I was going through other non-related pain as well...and for a couple of days in a row I ended up sleeping for 12+ hours and it was blissful. The second night of 12+ my shoulder pain completely went away and I was so grateful!
    I use to fight sleep so hard. I hated it! Now I love my sleep and often drift off embracing it and appreciating it. That point when I start drifting after a long day...can feel legit magical. Very euphoric sometimes!

  • @RawanMHan
    @RawanMHan 3 роки тому +48

    Sleeping is the best thing in my life 🙂😂❤

  • @The1belal
    @The1belal Рік тому +1

    Very comprehensive explanation in a nutshell - Thank you.

  • @hhughes9465
    @hhughes9465 3 роки тому +1

    My school showed my year group Matt Walker's Ted video a year or two ago. A fascinating, funny and slightly scary video. Glad you're working together with this new series!

  • @user-ml8if5lv7m
    @user-ml8if5lv7m 3 роки тому +1

    Glad they uploaded this series when I started having sleep problems

  • @Sara-ti7he
    @Sara-ti7he 3 роки тому +3

    Great video! I loved it! Sleep is so fascinating. Amazing animation too!

  • @ekulia
    @ekulia 3 роки тому

    Definitely will share it with my friends. thx for the vid!

  • @dailydoseofmedicinee
    @dailydoseofmedicinee 3 роки тому +56

    Sleep helps control our metabolism and weight, promotes stable moods, helps prevent cardiovascular diseases, boosts our immune system/function, increases knowledge retention, and helps us with long and short-term memory. Sleep is also essential for brain functioning.❤

    • @FabstaPizza
      @FabstaPizza 3 роки тому +2

      how come when i have a dream and i wake up, i see my surroundings but i see a little portal of my dream floating, and if i stare at it i will get sucked into that dream again?

    • @yahweh621
      @yahweh621 Рік тому

      Wow...how educated well informed information..

  • @tomasgomes8793
    @tomasgomes8793 3 роки тому +62

    "Let's take someone who typically goes to bed at 10pm, and they wake up at 6am"
    Yes, yes... that's exactly what I do.

    • @ChritterB-pm5ww
      @ChritterB-pm5ww 3 роки тому +1

      WHERE?
      ... Where do you want to "take someone who goes to sleep at 10:00 and wakes up at 6:00"❓⁉️‼️
      🛌💤💤💤💤💤
      take'em to bed •❓•

  • @marshy_mellow3735
    @marshy_mellow3735 3 роки тому +11

    I like this because I like learning-

  • @imortaldeadead
    @imortaldeadead 3 роки тому +1

    Interesting
    Thank you for sharing

  • @niuverrodriguezceballo1300
    @niuverrodriguezceballo1300 3 роки тому +4

    BESIDES YOU ARE SUCH A CLEAR TEACHER...AND ALL YOUR INFORMATION IS SO HEALTHFULL. I ONLY SLEEP 5 HOURS.

  • @LegendFromWoW
    @LegendFromWoW 3 роки тому +2

    Very educational

  • @nophima
    @nophima 3 роки тому +2

    TED is an awesome channel ❤

  • @abclearningenglish5843
    @abclearningenglish5843 3 роки тому

    Love you and thank you matt walker

  • @rickyko9493
    @rickyko9493 Рік тому

    Great video

  • @travity8001
    @travity8001 3 роки тому +1

    Very informative

  • @estudosleonel3096
    @estudosleonel3096 3 роки тому

    Obrigado pelo vídeo

  • @RazMunshi
    @RazMunshi 3 роки тому +4

    Nice talk

  • @softmusicforsleeping4075
    @softmusicforsleeping4075 2 роки тому +1

    I Love this peaceful Music😍
    Thank you for this video😍😍😍

  • @josuecenturiondomaniczky9297
    @josuecenturiondomaniczky9297 3 роки тому +2

    This guy is a master in sleeping

  • @user-sc5dy6ur2h
    @user-sc5dy6ur2h 3 роки тому +2

    Can you please make a series like this on healthy food?

  • @hunterG60k
    @hunterG60k 3 роки тому +10

    I'd be interested to see how depression affects the brainwaves of people with depression, ptsd, etc

  • @gallicus
    @gallicus 3 роки тому

    I love this

  • @thelastcube.
    @thelastcube. 3 роки тому

    A good synopsis regarding everything sleep in general :)

  • @alwayssomewhattired
    @alwayssomewhattired Рік тому

    Amazing!!!!

  • @Shazistic
    @Shazistic 3 роки тому +24

    You can’t pour from an empty cup. Take care of yourself first.
    -The Shades 💜💖💜

  • @ecoapril
    @ecoapril 2 роки тому

    It is very interesting science!

  • @healing-waves
    @healing-waves 3 роки тому

    Sending Love and Light Your Path ✨❤

  • @divy2972
    @divy2972 3 роки тому

    Currently watching this at 4 am !! WOW

  • @gitasri4091
    @gitasri4091 2 роки тому

    Amazing

  • @shoWbitz
    @shoWbitz 2 роки тому

    Thanks Macklemore. 👍👌

  • @BlackRose-dn7ke
    @BlackRose-dn7ke 3 роки тому

    Thanks for Persian 💞🙏🏻🙏🏻🙏🏻

  • @maje9448
    @maje9448 3 роки тому

    Keep going

  • @shazzasmile
    @shazzasmile 3 роки тому +41

    Was hoping for some good advice on getting a good night's sleep

    • @whatapp-.5397
      @whatapp-.5397 3 роки тому

      I recommend Mr Morris Trading Services to all willing individuals investors that wanna make huge profit from there capital investment.

    • @klintonbright8940
      @klintonbright8940 3 роки тому

      I have seen so much recommendation about Mr Morris here on UA-cam, I think his good works is really paying him well

    • @francescharlotte4650
      @francescharlotte4650 3 роки тому

      Guys go for Mr Morris, his the most sincere out there that can multiply your capital investment to huge profit, trade with him today and be happy you did.

    • @lanawoodside9806
      @lanawoodside9806 3 роки тому

      How can I get in touch with Mr Morris, his too popular, a lot of people talks good about him.

    • @kimmycuthberth2944
      @kimmycuthberth2944 3 роки тому

      +1 ( 8 4 7 ) 7 8 0 - 7 7 8 1

  • @joshua8354
    @joshua8354 3 роки тому

    That last bit had me shook

  • @thaianh123
    @thaianh123 8 місяців тому

    thankkkkkk

  • @xxxwhateverrr
    @xxxwhateverrr 3 роки тому +54

    I'm so distracted by this man's hair

    • @eclecticjon1019
      @eclecticjon1019 3 роки тому +3

      Yes, me too. I can't quite get over it.

    • @sparks2389
      @sparks2389 3 роки тому +1

      Me too

    • @zmkv8700
      @zmkv8700 3 роки тому +3

      What's wrong with it? 😂

    • @samsacres225
      @samsacres225 3 роки тому +3

      Liv S it’s very trump like
      I feel bad thst I can’t focus on what he is saying as well
      Clearly my brain needs more sleep to focus beyond the hair

    • @ChritterB-pm5ww
      @ChritterB-pm5ww 3 роки тому +1

      @Liv It's a back-and-forth between Hair and TEETH‼️💯‼️

  • @tomtruett1946
    @tomtruett1946 3 роки тому +12

    I was hoping to hear also about the stage of sleep in which the brain is cleaned of toxins. I think this is an underacknowledged phenomenon that has tremendous effect on our mental well being.

  • @bipbeedippy3954
    @bipbeedippy3954 3 роки тому +19

    Watching this right after being woken up by a bad dream.
    When did this dream occur?
    *_I don't need sleep, I need answers._*

    • @FabstaPizza
      @FabstaPizza 3 роки тому +2

      how come when i have a dream and i wake up, i see my surroundings but i see a little portal of my dream floating, and if i stare at it i will get sucked into that dream again?

    • @bipbeedippy3954
      @bipbeedippy3954 3 роки тому +1

      @@FabstaPizza wow that doesn't happen to me...
      maybe it's because you weren't fully awake and your brain was half asleep still, and when you focus on the dream, you just fall back asleep allowing your mind to pick up where you left off? Idk man that's kinda cool though.

  • @reshmaa1776
    @reshmaa1776 3 роки тому +2

    I really loves the animations

  • @brianevans9231
    @brianevans9231 Рік тому

    I should probably get round to doing this

  • @thedramuh1075
    @thedramuh1075 Рік тому

    This is Matthew Walker, he is the Founder and Director of the Center for Human Sleep Science. His book "Why we sleep" is an awesome read.

  • @rozvibes5013
    @rozvibes5013 3 роки тому

    💙💙💙 👏 thanks Sir

  • @yessumify
    @yessumify 2 роки тому +1

    Wish the whole video was the cartoon. It was satisfying while he talked us into sleep 😌

  • @shantanuthakare3299
    @shantanuthakare3299 3 роки тому

    Eagerly waiting for next sessions
    Btw Good night

  • @d3a1990
    @d3a1990 3 роки тому +1

    I’ve been having such incredible vivid and allegorical dreams lately. The UA-cam algorithm seems to have known that too.

  • @danieljackson4511
    @danieljackson4511 3 роки тому

    a video about improving sleep quality and how to fall asleep quick would be helpfull

  • @dallasreeves5285
    @dallasreeves5285 3 роки тому

    Watched this video on sleep to procrastinate going to sleep. Maybe I should watch that tedtalk on procrastination that's in the recommended under this video

  • @jenhasken
    @jenhasken 3 роки тому +6

    I get 8-9 hours every night. I never get sick amridiculously healthy, and it's not from other lifestyle factors (e.g. diet) being stellar. I'm convinced good regular sleep is the reason. It's importance cannot be overstated.

  • @curiouspodcast
    @curiouspodcast Рік тому +1

    I'm hoping to implement a positive bedtime routine of
    Think about something that I'm looking forward to the next day.
    Look at content in the evening that helps me at peace and helps relaxes me
    Make a gratitude list and why I"m appreciative of it.
    Be intention about my state of mind and how I decide to approach my surroundings.
    I'm curious to hear if anyone else has an evening routine and what it consists of.

  • @BlackRose-dn7ke
    @BlackRose-dn7ke 3 роки тому

    ممنون برای زیر نویس فارسی⁦🙏🏻⁩⁦🙏🏻⁩⁦🙏🏻⁩⁦🙏🏻⁩⁦🙏🏻⁩

  • @kimdavis2433
    @kimdavis2433 3 роки тому

    I have definitely noticed the boost in creativity during dreams; I took a musical composition class in university and struggled to come up with musical ideas, but sometimes when dreaming my mind generates new music out of thin air! I wish I could remember it to write it down...

  • @tiffotifo4081
    @tiffotifo4081 Рік тому

    once i had that witch scared me cuz i am a kid i am 7 years but i cried when it started.

  • @Vvvv-fx1yz
    @Vvvv-fx1yz 3 роки тому +3

    The title says 'Sleeping with science'
    Me: well I do it everyday on my study table(with science textbooks)

  • @rui-9-cs315
    @rui-9-cs315 3 роки тому

    amaing

  • @coolphantomgaming321
    @coolphantomgaming321 2 роки тому

    Cool

  • @sriarnitadahlan
    @sriarnitadahlan 3 роки тому +1

    I really love the ways he speaking, it's help me to improve my english☺️

    • @stevenmitchell1
      @stevenmitchell1 3 роки тому

      A lot of his speech is very poorly enunciated or colloquial, especially for someone who speaks British English.

  • @humanbeing140
    @humanbeing140 2 роки тому

    I never shared this with anyone since I don’t have any friends but all of a sudden I came across this video and felt like letting it out..
    Anyway I’m a guy who used to be in normal shape but things quickly changed.. during my board exams I would have my dinner around 10 pm then I would sit at 11 pm in the night for studying I would do this till 9 am in the morning since I’m not studious at all I never studied throughout the year I kept postponing which ultimately lead to all the burden on my head.. I would study only during exams so I literally used to chug every chapter and for some reason it stayed in my memory for 1 day next day I would produce that on the answer paper..so I would directly go for my exam without sleeping for even a minute
    My papers were scheduled from 11am to 2pm so after my exam i would sleep in the afternoon after returning say like 3pm to 8pm.. then again cycle continued... but I never experienced any health problems but slowly i started getting sick
    Now my situation has worsened so much that I don’t sleep during night time even when I try I cannot..... I’m just awake.. also now I’m obese and 24/7 I feel acidity nausea
    I’m overweight but i only eat 2 meals one during evening because that’s when I wake up like say 4 pm in the afternoon I’m up so at 6 pm I eat something like a sandwich and then I eat dinner at 3 in the morning yes 3am!!because I don’t feel like eating anything during this 6 to morning 3 gap weird I know.. and now I’m suffering I cannot change this habit my system has really adapted this what to do..? I’m awake from 3 am to 11 am then I feel like going sleep
    if I have something planned for next day I’ll go to sleep at 12 in the night I try sleeping sometimes it works sometimes doesn’t then I wake up at 8 am but still instead of feeling better I feel heart burning headache these things have been troubling me since years now I’m insomniac or what I don’t know.. coz sometimes i feel like sleeping but the minute I go to bed it disappears

  • @laurahellinghausen8826
    @laurahellinghausen8826 Рік тому

    This guy’s sleep gets amazing sleep

  • @vidhac5430
    @vidhac5430 3 роки тому +1

    0:45 for the little piece of fact

  • @prftaepps
    @prftaepps 3 роки тому +1

    Thats why it's so hard to get out of bed when you need to get up earlier but you can stay up late and wake up the same time you always do. Sometimes even if you want to go back to sleep you can't.

  • @Jay-sm6iy
    @Jay-sm6iy 2 роки тому

    Good night peeps

  • @Larry21924
    @Larry21924 5 місяців тому

    This content is evocative; similar to a book that evoked a strong response. "Better Sleep Better Life" by Various Authors

  • @imhuman3956
    @imhuman3956 3 роки тому

    Watching this before i go to sleep.

  • @RameyRocks
    @RameyRocks 2 роки тому +1

    I've always had lots of dreams what seems to be all night. A few years ago I had a sleep study done and the tech guy or whatever he would be called asked me the morning after my first night there if I had what felt like a normal night's rest to which I said yes, why? He said I only entered one stage of rem I stead of 3. I wish I had asked him what that meant because I've been looking for answers ever since.

  • @healing-waves
    @healing-waves 3 роки тому +1

    "Calm mind brings inner strength and self-confidence, so that's very important for good health." -- Dalai Lama
    Infinite Love Beautiful Soul! ✨❤

  • @thomasjcg7086
    @thomasjcg7086 3 роки тому +1

    Just this morning I was complaining about how I was still feeling tired after sleeping all night!

  • @thatwhiteshirtboii
    @thatwhiteshirtboii 3 роки тому

    Omg😱, he is the voice of the videos(I think)

  • @OnlyDreamScape
    @OnlyDreamScape 3 роки тому

    See that’s why I love sleeping

  • @markenscharles9419
    @markenscharles9419 Рік тому

    I am actually doing nrem sleep alot..

  • @commonsensei7246
    @commonsensei7246 2 роки тому

    Reminds me of punsie mcKale in flapjack

  • @gwugluud
    @gwugluud Рік тому +1

    I've wondered what Chuck Norris has been doing since leaving The Buzzcocks.

  • @JessicaMary0702
    @JessicaMary0702 2 роки тому

    He looks well rested

  • @samusande6461
    @samusande6461 Рік тому

    ❤️

  • @fkmyoutube
    @fkmyoutube 3 роки тому

    TED: The importance of sleep
    Also TED: Releases 3 videos simultaneously

  • @ithacacomments4811
    @ithacacomments4811 3 роки тому

    I am an older adult. I go to bed between 9-10 pm.
    I ruminate ....and do hourly bathroom visits until 1am.
    I then usually sleep from 1 am until 8 am....with a 5 am bathroom visit.
    At 8 am, I have a terrible time getting awake....all I want to do is sleep more.
    Old age is challenging.

  • @emersonsolomon2719
    @emersonsolomon2719 3 роки тому +6

    How many of them has a nightmare or falling like feeling and the next minute your awake..

    • @PazLeBon
      @PazLeBon 3 роки тому

      i hit the bottom once

  • @paulcallaby1829
    @paulcallaby1829 3 роки тому +1

    i love too sleep for then i dream and in my dreams i am someone,a free observer/participator at the same time......................amazing condition

  • @User-72430
    @User-72430 Рік тому +1

    Me @ 12am 🥺 watching this 😩

  • @THEOFFICIALultraswag12
    @THEOFFICIALultraswag12 3 роки тому +1

    how do you study this

  • @woojo7
    @woojo7 3 роки тому

    Get a fitbit, it will grade you sleep quality

  • @williamisenhower7967
    @williamisenhower7967 3 роки тому

    Matt Walker: Texas Dream Ranger

  • @jyotishkabasak7975
    @jyotishkabasak7975 2 роки тому

    Can a person feel external stimuli like tickling, someone shaking us or applying some kind of force on them during the deep sleep stage? Can people be woken up during this stage or are they unconscious totally to touch and sound?