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每当看到虫子们那一对对大眼睛，我们都会产生疑惑，它们没有眼皮，怎么睡觉呢？原来，这与快速动眼期有关。这是一个睡眠的阶段，是全部睡眠阶段中最浅的，眼球在此阶段快速移动，大脑神经元的活动也与大脑清醒的时候相同，而这种现象发生在所有哺乳类动物和鸟类动物身上。
Ever wonder why bugs are so bug-eyed？
Night crawlers
While a still bug might look like dozing， the creepy crawler is merely relaxing. Neuroscientists distinguish sleep from rest by pointing to specific kinds of brain activity， like dreaming， that take place when the body is in an immobile state.
According to neurological criteria， insects do not actually sleep.
Neither do fish， amphibians or mollusks. Lizards and mammals， on the other hand， need to catch their z’s.
REM Sleep
REM， or Rapid Eye Movement， sleep is thought to be associated with dreaming， and is required by a particularly complex kind of brain. REM sleep is common to humans and nearly all mammals. Birds also get REM sleep， but only in the early part of their lives.
Koalas and Congressmen are alike that they both need their shut-eye to recharge， while your average mollusk and insect stay OPEN 24 hours a day.
Vocabularies
Ever wonder why bugs are so bug-eyed？
Night crawlers
While a still bug might look like dozing， the creepy crawler is merely relaxing. Neuroscientists distinguish sleep from rest by pointing to specific kinds of brain activity， like dreaming， that take place when the body is in an immobile state.
According to neurological criteria， insects do not actually sleep.
Neither do fish， amphibians or mollusks. Lizards and mammals， on the other hand， need to catch their z’s.
REM Sleep
REM， or Rapid Eye Movement， sleep is thought to be associated with dreaming， and is required by a particularly complex kind of brain. REM sleep is common to humans and nearly all mammals. Birds also get REM sleep， but only in the early part of their lives.
Koalas and Congressmen are alike that they both need their shut-eye to recharge， while your average mollusk and insect stay OPEN 24 hours a day.
Vocabularies
