You think you're resting, but your brain is doing some serious housekeeping every single night. While you are asleep your brain clears out some memories and cements and reorganizes others. The brain also physically cleans itself with a flood of cerebrospinal fluid, which removes unnecessary proteins that can act as toxins.

你以为你在休息，但你的大脑每天夜里都在认真地管理“家务”。在你睡觉的时候，你的大脑会清理掉一些记忆，巩固和整理其他一些记忆。大脑还会用脑脊液自我清洁，去除不必要的有毒蛋白质。

5. GETTING PARALYZED 四肢麻痹

Your muscles are frozen for part of every night. It's actually normal and healthy to be paralyzed during sleep. During rapid eye movement (REM) sleep your brain is busy dreaming, but to protect yourself from responding to the dreams (for example, screaming when something scary happens or waving your arms to push away an oncoming danger in your dream), your body's muscles are paralyzed. It's possible to actually wake up during the tail end of this cycle and be awake but unable to move, which can be upsetting or even terrifying. It's also relatively common, having occurred to about 40 percent of people. These episodes usually pass quickly.

你的肌肉每天晚上都有一段时间会处于麻痹状态。在睡眠中感到麻痹是正常也是健康的。在快速眼动睡眠期间，你的大脑正忙着做梦，但为了保护自己不对梦中情景做出反应（比如在梦中发生可怕的事情时尖叫，或者挥舞你的手臂赶走梦中即将到来的危险），身体的肌肉会处于麻痹状态。在梦境临近结束时醒来，你可能会无法动弹，这可能会让你困扰甚至惊恐。这也是相对常见的，约有40%的人发生过这种情况。这种麻痹状态通常很快会过去。

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