9 Groundbreaking Discoveries About Sleep

  • Опубликовано: 5 фев 2017
  • There's a lot about sleep that we don't understand, like why we even sleep in the first place, for example. Here are some amazing discoveries biologists have made while trying to solve the mystery of sleep.
    Hosted by: Hank Green
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    Brain activity
    Brain centers
    Blue light

Комментарии • 1 757

  • ultra steve
    ultra steve 5 дней назад

    time to sleep to remember all this

  • 73isthebestnumber
    73isthebestnumber 9 дней назад

    At 7:04 that mofo is holding his phone upside down.

  • baxtor mozz
    baxtor mozz 10 дней назад

    Oh no Hank, you didnt! Why did you have to remind me of those cat videos?

  • Nathan Schubert
    Nathan Schubert 11 дней назад

    Didn't teach me how to eek out a better study vs sleep ratio. I am disappointed.
    Actually pretty interesting, but the above is a priority of mine at the moment. Though the blue light tip should help.

  • sarahxhart
    sarahxhart 12 дней назад

    All I hear is tested on animals... Over and over.

  • bobbytookalook
    bobbytookalook 14 дней назад

    I put this on 75% speed & Hank sounded drunk wanting to fall asleep!

  • Mary Seacross
    Mary Seacross 16 дней назад

    Does anyone out there sleep really well all the time? I am one who sleeps great almost all the time; I have full, elaborate dreams in full color, full sound, with orchestra like music, even. I have always slept well. I feel deeply rested when I awake. I feel like one does after a great movie , or a travel to a distant country, like I have had a relaxing adventure. and on top of all this I have to sleep during the day because I work all night long.
    I hear so much about insomnia in the news, but I can’t relate. Am I alone out there? Do other people sleep very well all the time??? Maybe Some one should study my sleep so that I can help others??

  • Name Taken
    Name Taken 17 дней назад +2

    Who else works nightshift.?

    • Mary Seacross
      Mary Seacross 16 дней назад +1

      Name Taken I do and I get great day sleep

  • Tay h
    Tay h 18 дней назад

    What I'd rather like to find out is why blue light, or even daylight does not affect my sleeping at all, and if not woken up by an alarm my sleep cycle seems to last about 11 to 12 hours......I feel like a mutant with the lamest superpower......

  • Jack Jammen
    Jack Jammen 18 дней назад

    What about Tesla?

  • My Perspective
    My Perspective 24 дня назад

    So, when your parents wake you up at 6 or 7 am to go to school they are actively counteracting your ability to learn.

  • Ashley Klug
    Ashley Klug 25 дней назад

    i have wicked insomnia and have stayed awake for six days. it was awful 😞

  • Skymouth
    Skymouth 25 дней назад

    I've been having insomnia and been getting 2-3 hours average of sleep a night. It sucks rocks!

  • Josue Castillo
    Josue Castillo Месяц назад

    If you want to know the answer why we sleep, go get Matt Walker's book "Why we sleep".

  • Rhys Logan
    Rhys Logan Месяц назад

    Yes our ancestors probably got less restful sleep and shorter hours, but most likely would have spent more time resting during the day and probably didn't often pull all nighters as commonly as modern humans, so this may have equaled out in the long run

  • Rhys Logan
    Rhys Logan Месяц назад

    Yes our ancestors probably got less restful sleep and shorter hours, but most likely would have spent more time resting during the day and probably didn't often pull all nighters as commonly as modern humans, so this may have equaled out in the long run

  • Garrett Neumann
    Garrett Neumann Месяц назад

    What do you do for a living besides SciShow? I don't believe that you spend every day researching to make more videos.

  • mrhappy0505
    mrhappy0505 Месяц назад

    His rapid arm movement "RAM" is putting me to sleep

  • Tahoe Jones
    Tahoe Jones Месяц назад

    You didn't mention pre-industrialization sleep patterns. 4 hours sleep, wake up and putter or have sex, then another 4 hours.
    Obvious omission.

  • Andrew Paramonoff
    Andrew Paramonoff Месяц назад

    Great video to watch at 04:45 am.

  • Nut Master
    Nut Master Месяц назад

    Watching this at 3:34

  • Lon Brooklyn
    Lon Brooklyn Месяц назад

    Giacamo needed Zolfidem for sleep a good sleep drug for emergencies

  • Dee Elmore
    Dee Elmore Месяц назад +1

    I had to replay the entirety of #4 because the first time through my brain wouldn't stop yelling "CONSTANTIN VON ECONOMO" at me

  • Joel Ayoub
    Joel Ayoub Месяц назад

    I've seen videos about the family with Fatal Famalial Insomnia. It's so horrible they wish for death.

  • AnteConfig
    AnteConfig Месяц назад

    it's been a year, do we know yet?

  • Sarah Camilla
    Sarah Camilla Месяц назад

    All those poor rats! 😰

  • Kannsree
    Kannsree 2 месяца назад


  • Shana Frazier
    Shana Frazier 2 месяца назад

    What about if you sleep too much? What about sleep disorders like narcolepsy?

  • Matthew Califana
    Matthew Califana 2 месяца назад

    Maybe Now we can take care of nyc rat problem ? If we could only rid the Rats in the white house !

  • Mike Page
    Mike Page 2 месяца назад

    What about the shift from biphasic to monophasic sleep?

  • Chase Davison
    Chase Davison 2 месяца назад

    I haven't had a dream since I was like 5 well I guess that's not true sometimes I dream but usually my dreams are just a black mass

  • MrBibo2050
    MrBibo2050 2 месяца назад

    "We still don't know why we sleep" proceeds to give pretty darn critical roles sleep has for the body. We already know why, it's important!

  • Shreeya Chitale
    Shreeya Chitale 2 месяца назад

    Poor rats

  • JOE Blow
    JOE Blow 2 месяца назад

    I love your channel... but this episode seems mostly about speculation and loose connections than actual science.

  • deathbeam320
    deathbeam320 2 месяца назад

    I click on video,
    Get a mattress ad.

  • Austin
    Austin 2 месяца назад

    6:00 creepy much

  • Dayton Estes
    Dayton Estes 2 месяца назад

    I am watching this while I can't sleep! My body is trying kill itself!

  • Ashley Tyler
    Ashley Tyler 2 месяца назад

    "scientists dont know why we sleep" We sleeo because were tired, Wheres my Pulitzer?

  • Mikayla Stewart
    Mikayla Stewart 3 месяца назад

    It's 3.30 am. Welp

  • Trey CB3
    Trey CB3 3 месяца назад +1

    World sleep day 😴

  • Luca Reichmann
    Luca Reichmann 3 месяца назад

    It would be more exact to say that the Hypthalamus is the part of our brain responsible for sleeping, not the Thalamus

  • LeadingTheCheer
    LeadingTheCheer 3 месяца назад

    my god all these horrible rat experiments .....

  • Bryantozero
    Bryantozero 3 месяца назад

    Truly, the best part of the day is drifting away.

  • maxis2k
    maxis2k 3 месяца назад

    Geez scientists. Lay off the rats!

  • Gaming Titan
    Gaming Titan 3 месяца назад

    Whats the difference between sleeping at night and day ? In terms of brain activity

  • em D
    em D 3 месяца назад

    I ❤ sleep
    Would love to see a video done about how different substance/ drugs effect your sleep and dreams.

  • FutureChaosTV
    FutureChaosTV 3 месяца назад

    Too much sleep is also very bad. After resting too long for several days, I get headaches and feel like a rock.

  • Ramey Zamora
    Ramey Zamora 3 месяца назад

    Couldn't finish this video once the rats who had been burned were deprived of sleep. We'd already heard about rats being tortured to death with sleep deprivation, and rats being tortured to determine their pain response during sleep deprivation. My turning stomach says the ends do not justify the means. We aren't just killing these animals. We are torturing them to death.

  • Ex0tic Br4d
    Ex0tic Br4d 3 месяца назад

    it said 9 but i only saw 8

  • Joseph Paterson
    Joseph Paterson 3 месяца назад

    watching this at 4am

  • frouto poto
    frouto poto 3 месяца назад

    I would prefer to not know what the lack of sleep causes than have innocent animals be tormented and get killed.
    I didn't plan to stop sleeping anyway

  • An Unentitled Motivated Millennial
    An Unentitled Motivated Millennial 3 месяца назад

    Yea tom we're still waiting to see if theres any real coralation between phones and sleep deprivation.

  • Natalia Ramírez
    Natalia Ramírez 3 месяца назад

    Is it funny that I fell asleep watching this video? Haha I think my anemia has come back 😂 greetings from Chile ❤

  • Asmita Gyawali
    Asmita Gyawali 3 месяца назад

    we sleep to be alive

  • Melissa Williams
    Melissa Williams 4 месяца назад

    you know what i learned the most from this video, the amount of crap that scientist put rats through

  • WildFyreful
    WildFyreful 4 месяца назад

    About the "being more receptive to pain after not sleeping" bit:
    As a result of my Asperger's I have sensitive hearing, so loud noises are not only obnoxious but can be painful. I also have random bouts of insomnia. After not sleeping, my sensitivity to noise is amped up to absurd levels -- for example, just putting silverware away or shutting a drawer a little too hard is physically painful, whereas if I got sleep it isn't. Even my parents talking at normal volume seems louder and more painful.
    I told a doctor about this and he basically went "Dafuq??" In all his years he had never heard of this weird thing that happens to me.

  • Roselyn Alvarez
    Roselyn Alvarez 4 месяца назад

    OMG. Poor rats what have they been doing to them. My God!

  • Van Jerome Pena
    Van Jerome Pena 4 месяца назад

    Not sleeping caused rats to have weight loss and faster metabolism. Seems like a good thing.

  • Jazzy Smith
    Jazzy Smith 4 месяца назад

    i guess its ironic that i stayed up all night watching these vids...

  • Brandon VanVorst
    Brandon VanVorst 4 месяца назад

    The studies I found and things I've warched, they have figured out why we need to sleep. There is pretty much a laundry list of thing that happen during sleep. Without sleeping they don't get done or don't get done as well that pretty much leads to failure of functions and sickness/death

  • Colby Izzo
    Colby Izzo 4 месяца назад

    Don't feel to bad for rats they did spread the black and bubonic plague and killed over 70 million people

  • Griffon Dahrk
    Griffon Dahrk 4 месяца назад

    Poor rats...

  • Eriktion
    Eriktion 4 месяца назад

    wow the ass holes took away the rats sleep, shocked and burned them...

  • Scuba Steve
    Scuba Steve 4 месяца назад

    What about polyphastic sleeping?

  • Atom Nous
    Atom Nous 4 месяца назад

    Do we have to know? Everyone is going to die even if you are immortal.

  • Ionic
    Ionic 4 месяца назад


  • abcdefg hijklmno
    abcdefg hijklmno 4 месяца назад

    I'm watching this too late its going to affect my sleep.
    Also the editor is cramming to much info, hence the quick in between scences being crammed together leading to insufficient time between ideas. Fix: Write a script that explains the concept more subsequently, so the host does not come off talking too fast.

  • Thomas Bernecky
    Thomas Bernecky 4 месяца назад

    Please please please sit on your hands, very distracting from the subject.

  • Quickening TJ
    Quickening TJ 4 месяца назад

    It took 2/3 weeks torturing to death some rats by not letting them sleep. Harsh.
    Edit - sorry whats that about burn wounds? Do some people become scientists purely to be psyco's to animals?

  • Ke Qin Yang
    Ke Qin Yang 4 месяца назад


  • Clarck'sVlogPh
    Clarck'sVlogPh 4 месяца назад

    Is not sleeping will kill you not an answer to why we sleep? i need An Answer PLS!

  • Noe Potvin
    Noe Potvin 4 месяца назад

    At 8:05, Hank, I think you said “watch SciShow with your cat in the middle of the night” wrong...

  • Swervin309
    Swervin309 4 месяца назад

    The newer Samsung phones have a selectable blue light filter. Works well.

  • Smoke 420 & Chill Andromeda Star Struck
    Smoke 420 & Chill Andromeda Star Struck 4 месяца назад +3

    Poor mice, I feel so bad for the torture they have to go threw.

  • Nerdee79
    Nerdee79 4 месяца назад

    This episode just makes me feel bad for rats.

  • Alejandro Ortiz
    Alejandro Ortiz 4 месяца назад

    "Blue light will disrupt your sleep"
    -Background is blue

  • kelly shea
    kelly shea 4 месяца назад

    I have a herniated disc at my L5 S1 and dextroscoliosis also of the lumbar and a history of insomnia. I literally can not sleep without meds

  • Ryan Torres
    Ryan Torres 4 месяца назад

    Your hands keep on moving unnecessarily. It is annoying.

  • Oblivion Me
    Oblivion Me 4 месяца назад

    You better change your somewhat blue background.

  • Oblivion Me
    Oblivion Me 4 месяца назад

    Arabic Subtitles? This channel is now
    looking like ISIShow

  • Saeed Baig
    Saeed Baig 4 месяца назад

    1:43 - "Studies done on rats in the 1980s confirmed that sleep deprivation on it's own is fatal."
    Professor: "So what field do you want to do research in? Climate change? Medicine?"
    Scientist: "I want to see if we can kill rats through sleep deprivation".
    Professor: "Dude... is everything ok at home?"

  • Luna Lovegood
    Luna Lovegood 4 месяца назад

    Dont do meth

  • 1980Baldeagle
    1980Baldeagle 5 месяцев назад

    machines need down time for maintainability. If you don't maintain the equipment, it breaks down prematurely. That's what happens when you sleep, primarily in your dome piece.

  • The King
    The King 5 месяцев назад

    I lotteraly fall asleep while watching this video! Seriusly my ipad fall to thhe grownd so i woke up

  • aaron faucett
    aaron faucett 5 месяцев назад

    What I hear you say is that naps are a good thing..? 😂

  • Nostr' Alma Mater
    Nostr' Alma Mater 5 месяцев назад

    Most people who go to sleep clinics have trouble sleeping. I wonder if they could learn anything from someone like me? I fall into mini coma's and dream vividly every night. I'm also difficult to wake up.

  • Alejandro Rodolfo Mendez
    Alejandro Rodolfo Mendez 5 месяцев назад

    i use the program f.lux to auto regulate the lights of my computers. after a couple of months the change it is noticeable, i could sleep more and also i do not keep watching videos at midnight every night. still i am starting to worry about those light on the computer fans.

  • Waldo
    Waldo 5 месяцев назад

    I know I'm not the only one watching this while sleep deprived

  • Taylor Smith
    Taylor Smith 5 месяцев назад

    What about the "2nd sleep", which was common in the Chaucer era? And/or are there any myths behind that?

  • Trey321 Godsloveld@gmail.com
    Trey321 Godsloveld@gmail.com 5 месяцев назад

    You don't know why we sleep but proceed to explain what happened when we don't sleep? Please do not respond to this automated response muh fukka.

  • GiggleMeBlaH BlaH
    GiggleMeBlaH BlaH 5 месяцев назад

    Pretty sad how I haven’t slept and it’s already 6 Am.... I’m taking advantage of my winter vacation...

  • Dane Dickerson
    Dane Dickerson 5 месяцев назад

    Who else is watching this video at midnight, with blue light, and trying to pull an all nighter?

  • Daniel Diaz
    Daniel Diaz 5 месяцев назад

    fatal familial insomnia? cant doctors like. just give them heavy sedatives. induce a coma. anesthesia. etc. basically forcing their bodies to shut down.

  • Ryan N
    Ryan N 5 месяцев назад

    1:18 Bro, life is ultimately fatal

  • The Canine Nutritionist
    The Canine Nutritionist 5 месяцев назад

    Right now, millions of mice, rats, rabbits, primates, cats, dogs, and other animals are locked inside barren cages in laboratories across the country. They languish in pain, ache with loneliness, and long to be free. Instead, all they can do is sit and wait in fear of the next terrifying and painful procedure that will be performed on them.

  • Lorraine Williams
    Lorraine Williams 6 месяцев назад

    All the talk of animals being tortured to death really put me off.

  • Aaron Bale
    Aaron Bale 6 месяцев назад

    Wrong. Brains need to sleep in order to urinate. www.ted.com/talks/jeff_iliff_one_more_reason_to_get_a_good_night_s_sleep/up-next

  • Alexander Wu
    Alexander Wu 6 месяцев назад

    Maybe aging is caused by sleep deprivation.

  • Kaustubh Funde
    Kaustubh Funde 6 месяцев назад

    I was about to show this to my mom until 7:07

  • Raymond Hmuifoo
    Raymond Hmuifoo 6 месяцев назад

    When I was a kid I was afraid to take naps. I thought that was how you got kidnapped.