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
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Комментарии • 1 690

  • Melissa Williams
    Melissa Williams 6 дней назад

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

  • WildFyreful
    WildFyreful 8 дней 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 8 дней назад

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

  • Van Jerome Pena
    Van Jerome Pena 9 дней назад

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

  • Jazzy Smith
    Jazzy Smith 11 дней назад

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

  • Brandon VanVorst
    Brandon VanVorst 12 дней 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 13 дней 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 14 дней назад

    Poor rats...

  • Eriktion
    Eriktion 16 дней назад

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

  • Scuba Steve
    Scuba Steve 17 дней назад

    What about polyphastic sleeping?

  • Atom Nous
    Atom Nous 19 дней назад

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

  • Ionic
    Ionic 21 день назад


  • abcdefg hijklmno
    abcdefg hijklmno 21 день 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 24 дня назад

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

  • Quickening TJ
    Quickening TJ 24 дня 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 27 дней назад


  • clarck tumazar
    clarck tumazar 27 дней назад

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

  • Noe Potvin
    Noe Potvin 27 дней назад

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

  • Swervin309
    Swervin309 28 дней 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 29 дней назад +2

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

  • Nerdee79
    Nerdee79 29 дней назад

    This episode just makes me feel bad for rats.

  • Alejandro Ortiz
    Alejandro Ortiz Месяц назад

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

  • kelly shea
    kelly shea Месяц 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 Месяц назад

    Your hands keep on moving unnecessarily. It is annoying.

  • Oblivion Me
    Oblivion Me Месяц назад

    You better change your somewhat blue background.

  • Oblivion Me
    Oblivion Me Месяц назад

    Arabic Subtitles? This channel is now
    looking like ISIShow

  • Saeed Baig
    Saeed Baig Месяц 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 Месяц назад

    Dont do meth

  • 1980Baldeagle
    1980Baldeagle Месяц 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.

  • Nikolay Penchev
    Nikolay Penchev Месяц назад

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

  • aaron faucett
    aaron faucett Месяц назад

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

  • Ashley Carttar
    Ashley Carttar Месяц 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 Месяц 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.

  • Descythia The Hoodless
    Descythia The Hoodless Месяц назад

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

  • Taylor Smith
    Taylor Smith Месяц 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 Месяц 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 Monteserin
    GiggleMeBlaH Monteserin Месяц 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 Месяц назад

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

  • DinoMemezz
    DinoMemezz Месяц назад

    its 2:45 am so after this vid im gonna go get a good nights sleep for the rest of the year (I mean 2018 and 2017)

  • Daniel Diaz
    Daniel Diaz Месяц 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 Месяц назад

    1:18 Bro, life is ultimately fatal

  • The Canine Nutritionist
    The Canine Nutritionist 2 месяца 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 2 месяца назад

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

  • Aaron Bale
    Aaron Bale 2 месяца 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 2 месяца назад

    Maybe aging is caused by sleep deprivation.

  • Kaustubh Funde
    Kaustubh Funde 2 месяца назад

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

  • Raymond Hmuifoo
    Raymond Hmuifoo 2 месяца назад

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

  • Rin Kagamine
    Rin Kagamine 2 месяца назад

    🎶The Science Show!🎶
    *Piano drops on guy*
    Guy: Who’s idea was this?!

  • Bissan Obaid
    Bissan Obaid 2 месяца назад

    Can we actually trick our brain?it IS our brain basically telling itself to tricl itself. Placebos also work when the one using them doesnt know theyre placebos.
    Great videos

  • Nico Angelo Bado
    Nico Angelo Bado 2 месяца назад

    Casing point, it's almost 9pm now. Time to get to bed.

  • Hewi Kiwi
    Hewi Kiwi 2 месяца назад

    Poor rats

  • mumblernumber
    mumblernumber 2 месяца назад

    Who the hell burned rats?

    RXMOH 3 месяца назад +2

    Im in love with science

  • Tolliver
    Tolliver 3 месяца назад

    I know this is an old video but the study on sleep deprivation in rats is given as an example in some of my classes as a biased study. The rats were kept awake by keeping them on a pedestal with a spinning wall on it, surrounded by water. If they fell asleep the slow moving wall would knock them into the water, so they would wake up or drown. They could have died of stress, not of sleep deprivation. It doesn't mean that insomnia can cause death, because the rats weren't awake due to insomnia, but forced awake.

  • skyler anderson
    skyler anderson 3 месяца назад

    When I'm depriving myself of sleep watching this vid

  • Evi1M4chine
    Evi1M4chine 3 месяца назад +2

    *COULD YOU PLEASE FUCKIN BREATHE BETWEEN SENTENCES,* and give us time to take up the information?? You talk without a single fuckin pause! Whoever cuts these videos, need to be cut too!! _With a spoon!_ Why a spoon? Because it hurts more!

  • Evi1M4chine
    Evi1M4chine 3 месяца назад +1

    *Genetic disorders are not ”incurable“ anymore!*
    ”incurable“ is arrogant god-complex doctor speak anyway. You mean ”1.
    we 2. do not know, how to cure it 3. yet!“. As opposed to ”never ever in all of the universe forever!“

  • V Morrissey
    V Morrissey 3 месяца назад


  • ikill GHOSTundDEMONSinMYsleep
    ikill GHOSTundDEMONSinMYsleep 3 месяца назад

    I thought sleeping shortens it like
    I learned math and stuff the next morning I forget all those equations for my advanced classes

  • ikill GHOSTundDEMONSinMYsleep
    ikill GHOSTundDEMONSinMYsleep 3 месяца назад

    If u tape the eyes of a FFI sufferers
    Make an sleep? Idk

  • Jeffrey Salvador
    Jeffrey Salvador 3 месяца назад

    Who else is here because they can't sleep....btw thanks for the answer "blue light" I should probably put my phone away

  • Delimbiyra ღ
    Delimbiyra ღ 3 месяца назад

    I oversleep all the time, what could this mean?

  • Squeekuto Uzumaki
    Squeekuto Uzumaki 3 месяца назад

    I get sick (more specifically have a glandular fever relapse) when I don't get enough sleep😩

  • Jai Lec
    Jai Lec 3 месяца назад

    Stop harming rats please...
    It makes me feel sad...

  • Steven Nesfeder
    Steven Nesfeder 3 месяца назад

    what i took from this video: not sleeping will make you lose weight

  • Loshi
    Loshi 3 месяца назад +2

    can anyone give me some examples of apps that remove blue light :)

  • iiTotally_Tas
    iiTotally_Tas 3 месяца назад

    i have insomnia sooo..... XD

  • G Blake
    G Blake 3 месяца назад

    Awful and disgusting that was done to such sweet, intelligent and innocent animals. Humans are so often just a swollen boil on the earth. I am ashamed of my species.

  • funmod gaming
    funmod gaming 3 месяца назад

    ignore the fact that its 5am im voluntarily awake cause im not tired not cause of blue light just to be clear

  • funmod gaming
    funmod gaming 3 месяца назад

    cant sleep now cause of the blue background thanks a lot dork

  • Eric Scott
    Eric Scott 3 месяца назад

    Very fascinating! And now, I am going to go to sleep. Good night!

  • Black Iron Seamus
    Black Iron Seamus 3 месяца назад

    Warning jumpscare at 5:58

  • jasmine acosta
    jasmine acosta 3 месяца назад

    Hank !! 😀

  • Saad Ansari
    Saad Ansari 3 месяца назад

    I had got habit of sleeping @ 12-1 am a few months ago but now I sleep mostly around 11 pm and most lately 11.30.

  • Saad Ansari
    Saad Ansari 3 месяца назад

    SLEEP AT 11 WAKE AT 7... BEST!!! Atleast for me... during sundays...
    Other days: 10.30-6.30

  • Earthium
    Earthium 3 месяца назад

    Sweet dreams are made of memes, who had a mind to disagree.

  • apostle333
    apostle333 4 месяца назад

    I wonder if there's a connection here. I always have this experience I call "the big small" It feels like I'm both galactic and atomic at the same time. It prevent me from sleeping when it gets out of control. I wonder if there is a connection there?

  • ElephantHut
    ElephantHut 4 месяца назад

    I feel bad for the rats :(

  • pranay forever
    pranay forever 4 месяца назад

    Blah blah blah... too much talking

  • MarschStudios
    MarschStudios 4 месяца назад

    Thanks for making these phenomenal videos. I've read an article or two suggesting that in past eras (Medieval, etc) humans had "two sleeps:" they went to sleep with the sun, woke in the middle of the night and went about their business, and then slept again until sunrise. Could you research this and make a video?

  • Keilani Kekoa
    Keilani Kekoa 4 месяца назад

    Watching this in bed before sleep

  • Kat!668 Japan!668
    Kat!668 Japan!668 4 месяца назад

    I have severe insomnia. When im not in a sport i get about two to four hours of sleep per day and once a week i would get no sleep. When i am in a sport i oversleep. I get ten to twelve hours of sleep per night. . .

  • Intex Cloud S9
    Intex Cloud S9 4 месяца назад

    exit light enter night...off to never never land

  • Sixtine
    Sixtine 4 месяца назад

    Poor rats.

  • Derek Knight
    Derek Knight 4 месяца назад

    What a trip! CSF cleaning the brain in dishwasher mode. Thanks for the video!

  • TCGBattling Master
    TCGBattling Master 4 месяца назад

    i listen to these to fall asleep

  • Rafael Eleutério
    Rafael Eleutério 4 месяца назад

    ok, sleep deprivation can kill you, but... what about excess sleeping? What happens to your body when you force it to sleep more than it needs?

  • J.A. Wolf
    J.A. Wolf 4 месяца назад

    WTF. Did the rats volunteer to be painfully shocked and burned in the name of human-centric science?

  • DaveTheWave
    DaveTheWave 4 месяца назад +2

    Watching videos helps me fall asleep it doesn’t prevent me from falling asleep

  • Sam Stevenson
    Sam Stevenson 4 месяца назад

    Not sleeping to watch this video

  • JustyFied
    JustyFied 4 месяца назад

    Just me or does the doctor at 4:20 look high?

  • adecree
    adecree 4 месяца назад

    Did they really have to burn the rats?..

  • d bush
    d bush 4 месяца назад

    There was no mention of what happens when you sleep too much. Maybe another video for that topic?

  • Jolie Giacomo
    Jolie Giacomo 4 месяца назад

    Can you cry in your sleep? I've recently gone through heartbreak. Daytime I listen to nothing funny things & stay busy. However when I woke up my face was swollen as if I had been bawling all night. No food allergies.

  • MythologicalXX
    MythologicalXX 4 месяца назад

    HEY! I know why we go to sleeps!

    We get tired

  • MyBubbleInSpace
    MyBubbleInSpace 5 месяцев назад

    Could you make a video on narcolepsy? And hopefully on the potential studies for a cure? I've had it since I had the vaccination against swine flu in 2009 and would really appreciate it. Love your channels!

  • llarry2769
    llarry2769 5 месяцев назад

    thinking of how many rats had to die is going to keep me awake at nights

  • William Calhoun
    William Calhoun 5 месяцев назад

    Quit the unnecessary sadistic animal experiments. Did we really need to know that so badly that we had to torture something to find it out?

  • Lightningmonky 7
    Lightningmonky 7 5 месяцев назад

    We sleep because we're tired, DUH

  • another one
    another one 5 месяцев назад

    "I never sleep cause sleep is the cousin of death"