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  • [Yawning] Where are my car keys?

  • Hey sleepyheads, Jules here for Dnews!

  • We've all been there.

  • You stay up until 5am studying because you forgot you had a final worth 60% of your grade

  • the next morning.

  • Then, after just an hour or two of sleep, you wander around in a dull haze, like you're

  • drunk or something.

  • Also you fail your final.

  • In fact, being sleep deprived is not altogether different from being drunk, in regards to

  • feeling impaired, and being unable to complete basic tasks.

  • One study from 2000, done by researchers from Australia and New Zealand, took a group of

  • volunteers and kept them from sleeping for up to 28 hours.

  • Then progressively gave them a series of tests, in areas such as cognitive demand, reaction

  • speed, hand-eye coordination, memory, and perception.

  • At another date, they got the same group of participants drunk, first to a blood alcohol

  • level of .05, then to .1, and gave them the same series of tests.

  • The researchers found that at around the 17 to 19-hour sleepless mark, the participants

  • scored similarly to when their blood alcohol level was around 0.05, or slightly worse.

  • Some participants even showed impairment equivalent to 0.1, past the legal drinking limit for

  • driving in the United States of 0.08.

  • What that means is if you stay up late and decide to go for a drive, you are effectively

  • drunk driving.

  • So what's happening in your brain when you're sleep deprived?

  • Well another study from 2000 out of UC San Diego, used fMRIs to look at sleep deprived

  • brains while performing verbal learning tasks.

  • They found that the prefrontal cortex, which is involved in personality, planning, decision

  • making, and social behavior, was working overtime, lighting up much more than it would in the

  • brain of a person who'd had a restful night of sleep.

  • While it may seem counterintuitive, this higher activity is actually a bad thing, since it

  • shows that the brain has to work harder to perform the same tasks.

  • Then they looked at the temporal lobe, which controls your hearing, speech, and vision,

  • as well as long term memory.

  • In sleep deprived subjects, this part of the brain was relatively quiet, when otherwise

  • it would have been lighting up in restful subjects.

  • If you've noticed, sleepy people tend to slur their speech, not unlike drunk people,

  • and for both, that process is related the temporal lobe.

  • Meanwhile, to make up for this lack of activity, the parietal lobe steps in, and while it also

  • deals with sensory input, it doesn't do as good of a job at the specific tasks the temporal

  • lobe deals with.

  • Which is why you are still able to do those tasks, just really really poorly.

  • Clearly, your brain works differently when you're sleepy.

  • Sleep let your brain's neurons rest and regain sensitivity by shutting off your neurotransmitters.

  • To quickly explain: the neurons in your brain are individual cells capable of communicating

  • information using electricity and chemicals.

  • Some of those chemicals are calledneurotransmitters”, including serotonin, dopamine, and histamine.

  • After being bombarded with chemicals all day, your neurons lose sensitivity, which has been

  • proposed as the reason your brain seems to be working more slowly, the more tired you

  • are.

  • Basically, staying up past your bedtime is pretty bad for your cognitive function, and

  • so is drinking.

  • That's pretty scary, because according to Harvard Medical School, roughly a quarter

  • million drivers fall asleep at the wheel every single day.

  • So remember, if you're going to be staying up late, get yourself a designated driver.

  • For more stories that inform you, check out our sister channel Seeker Stories.

  • They recently went to Hawaii to find out how untreated wastewater from cesspools of poop

  • are hurting coral reefs.

  • You can watch the video here.

  • And over on Seeker VR, you can visit the Oceti Sakowin camp at Standing Rock where water

  • protectors are standing strong after their victory against the Dakota Access Pipeline.

  • Watch this video to see the harsh realities that they're facing.

  • Thanks for watching DNews!

[Yawning] Where are my car keys?


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B2 中上級

睡眠不足が体に与える影響 (What Sleep Deprivation Does To Your Body)

  • 59 1
    Courtney Shih に公開 2021 年 01 月 14 日