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 • 1 730

  • Joel Ayoub
    Joel Ayoub 19 часов назад

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

  • AnteConfig
    AnteConfig 21 час назад

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

  • Sarah Camilla
    Sarah Camilla День назад

    All those poor rats! 😰

  • Kannsree
    Kannsree 3 дня назад


  • Shana Frazier
    Shana Frazier 5 дней назад

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

  • Matthew Califana
    Matthew Califana 12 дней 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 15 дней назад

    What about the shift from biphasic to monophasic sleep?

  • Chase Davison
    Chase Davison 16 дней 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 17 дней 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 18 дней назад

    Poor rats

  • JOE Blow
    JOE Blow 22 дня назад

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

  • deathbeam320
    deathbeam320 22 дня назад

    I click on video,
    Get a mattress ad.

  • Austin
    Austin 23 дня назад

    6:00 creepy much

  • Dayton Estes
    Dayton Estes 25 дней назад

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

  • Ashley Tyler
    Ashley Tyler Месяц назад

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

  • Mikayla Stewart
    Mikayla Stewart Месяц назад

    It's 3.30 am. Welp

  • Trey CB3
    Trey CB3 Месяц назад +1

    World sleep day 😴

  • Luca Reichmann
    Luca Reichmann Месяц 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 Месяц назад

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

  • Bryantozero
    Bryantozero Месяц назад

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

  • maxis2k
    maxis2k Месяц назад

    Geez scientists. Lay off the rats!

  • Gaming Titan
    Gaming Titan Месяц назад

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

  • em D
    em D Месяц назад

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

  • FutureChaosTV
    FutureChaosTV Месяц 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 Месяц 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 Месяц назад

    it said 9 but i only saw 8

  • Joseph Paterson
    Joseph Paterson Месяц назад

    watching this at 4am

  • frouto poto
    frouto poto Месяц 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 Месяц назад

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

  • Natalia Ramírez
    Natalia Ramírez Месяц 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 Месяц назад

    we sleep to be alive

  • Melissa Williams
    Melissa Williams 2 месяца назад

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

  • WildFyreful
    WildFyreful 2 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 2 месяца назад

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

  • Van Jerome Pena
    Van Jerome Pena 2 месяца назад

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

  • Jazzy Smith
    Jazzy Smith 2 месяца назад

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

  • Brandon VanVorst
    Brandon VanVorst 2 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 2 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 2 месяца назад

    Poor rats...

  • Eriktion
    Eriktion 2 месяца назад

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

  • Scuba Steve
    Scuba Steve 2 месяца назад

    What about polyphastic sleeping?

  • Atom Nous
    Atom Nous 2 месяца назад

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

  • Ionic
    Ionic 2 месяца назад


  • abcdefg hijklmno
    abcdefg hijklmno 2 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 2 месяца назад

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

  • Quickening TJ
    Quickening TJ 2 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 2 месяца назад


  • Clarck'sVlogPh
    Clarck'sVlogPh 2 месяца назад

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

  • Noe Potvin
    Noe Potvin 2 месяца назад

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

  • Swervin309
    Swervin309 2 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 2 месяца назад +2

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

  • Nerdee79
    Nerdee79 2 месяца назад

    This episode just makes me feel bad for rats.

  • Alejandro Ortiz
    Alejandro Ortiz 2 месяца назад

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

  • kelly shea
    kelly shea 2 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 2 месяца назад

    Your hands keep on moving unnecessarily. It is annoying.

  • Oblivion Me
    Oblivion Me 2 месяца назад

    You better change your somewhat blue background.

  • Oblivion Me
    Oblivion Me 2 месяца назад

    Arabic Subtitles? This channel is now
    looking like ISIShow

  • Saeed Baig
    Saeed Baig 2 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 2 месяца назад

    Dont do meth

  • 1980Baldeagle
    1980Baldeagle 3 месяца 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 3 месяца назад

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

  • aaron faucett
    aaron faucett 3 месяца назад

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

  • Ashley Carttar
    Ashley Carttar 3 месяца 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 3 месяца 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 3 месяца назад

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

  • Taylor Smith
    Taylor Smith 3 месяца 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 3 месяца 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 3 месяца 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 3 месяца назад

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

  • Daniel Diaz
    Daniel Diaz 3 месяца 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 3 месяца назад

    1:18 Bro, life is ultimately fatal

  • The Canine Nutritionist
    The Canine Nutritionist 3 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 4 месяца назад

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

  • Aaron Bale
    Aaron Bale 4 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 4 месяца назад

    Maybe aging is caused by sleep deprivation.

  • Kaustubh Funde
    Kaustubh Funde 4 месяца назад

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

  • Raymond Hmuifoo
    Raymond Hmuifoo 4 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 4 месяца назад

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

  • Bissan Obaid
    Bissan Obaid 4 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 4 месяца назад

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

  • Hewi Kiwi
    Hewi Kiwi 4 месяца назад

    Poor rats

  • mumblernumber
    mumblernumber 4 месяца назад

    Who the hell burned rats?

    RXMOH 4 месяца назад +2

    Im in love with science

  • Tolliver
    Tolliver 4 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 4 месяца назад

    When I'm depriving myself of sleep watching this vid

  • Evi1M4chine
    Evi1M4chine 5 месяцев назад +6

    *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 5 месяцев назад +2

    *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!“

    • Apollo
      Apollo 19 дней назад

      Evi1M4chine I agree

  • V Morrissey
    V Morrissey 5 месяцев назад


  • ikill GHOSTundDEMONSinMYsleep
    ikill GHOSTundDEMONSinMYsleep 5 месяцев 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 5 месяцев назад

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

  • Jeffrey Salvador
    Jeffrey Salvador 5 месяцев 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 5 месяцев назад

    I oversleep all the time, what could this mean?

  • Squeekuto Uzumaki
    Squeekuto Uzumaki 5 месяцев назад

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

  • Jai Lec
    Jai Lec 5 месяцев назад

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

  • Steven Nesfeder
    Steven Nesfeder 5 месяцев назад

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

  • Loshi
    Loshi 5 месяцев назад +2

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

  • iiTotally_Tas
    iiTotally_Tas 5 месяцев назад

    i have insomnia sooo..... XD

  • G Blake
    G Blake 5 месяцев 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 5 месяцев 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 5 месяцев назад

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