B2 中高級 美國腔 21524 分類 收藏
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have you ever been drifting off to sleep in your bed all quiet at night and
suddenly feels like you're falling in your whole body twitches what is that
well that's a jerk, a hypnic jerk to be precise, a hypnic jerk sometimes called a sleep start is
the scientific term for what happens when you jump in your sleep there the
involuntary muscle twitches that happened in your arms legs or even your
entire body as you drift off to dreamland, most people get them roughly
70% of the population jumps in their sleep, but why do they happen
there are two main theories based on neural science and evolution most common
explanation is that as you fall asleep there are two different systems your
brain that are basically battling each other. System number one, a network of
nerve cells called the reticular activating system is just below your
cerebral cortex the big wrinkly part of your brain. when this system is in full
force you feel alert, it essentially helps keep you awake. system number two
call the ventrolateral preoptic nucleus or VLP0 for short is located near the
optic nerve and influences your sleep cycle, the VLP0 sometimes referred
to as the sleeps switch, as you fall asleep each night or during nap time
the VLP0 system begins to take control from the reticular activating
system during this hand off from one system to another the alert part of your
brain can still sometimes stimulate your muscles causing twitches, these hypnic jerks are
last-ditch attempts by the reticular activating system to maintain control of
your body as you more or less choose to sleep, system number one usually
seized control the system number two the VLP0 and the hypnic jerks eventually
stopped, so these jerks are thought to be the result of a sleeping waking war
happening in your body each time you try to get some shut-eye, another less common
theory for what causes hypnic jerks involve our primate ancestors. some scientists think
that the ancient primate brain associated relaxation or the beginning
stages of sleep with falling out of a tree, hypnic jerks were a way of waking the
primate up quickly so they could take action and possibly break their fall.
so these muscular twitches might have stayed with us as we evolved over the years.
whatever causes hypnic jerks they're nothing to worry about according
to most experts but if you don't love getting jolted awake feeling like you're
plummeting near-death there are some steps you can take to limit how many
sleep start to experience things like high caffeine consumption, working out in the evening hours,
high stress levels and lack of sleep can cause more frequent
and more intense hypnic jerks, so cutting back on the coffee, getting your workout
done in the morning and managing your stress levels and sleeping patterns
might result in fewer hypnic jerks, but like I said they're not dangerous
so if they don't bother you, no need to ditch your afternoon latte, there're bigger jerks
out there to battle after all. Thanks to all of our patrons on patreon for not being jerks
you keep these answers coming you'd like to submit a question to be
answered or get some videos a few days before everyone else, just go to
patreon.com/scishow and don't forget to go to youtube.com/scishow
and subscribes.
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你是否會在睡覺時抽動?來看看科學怎麼說吧!(Why Do We Jump in Our Sleep?)

21524 分類 收藏
Joseph Yap 發佈於 2016 年 7 月 8 日    Joseph Yap 翻譯    Mandy Lin 審核
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