when you're repairing your car,

当你要修理汽车时
the first thing you do is you stop it and shut off the engine.

你要做的第一件事情是停车关掉引擎
You make it stable and at rest so you can then work on repair.

让它静止这样你就可以修理它了
A related view is that sleep emerged to preserve energy

一个相关的观点是睡眠是为了保存能量
and keep you out of trouble at night.

以及晚上不惹是生非
And these views are of course not incompatible.

当然这些观点是不相容的
This explains why we sleep at all and this probably

这解释了为什么我们要睡觉
explains why we sleep at night.

可能解释了我们为什么要在晚上睡觉
There are sleep disorders. I won't go through them.

存在睡眠障碍我不会把它们全部列举出来
I just list a few of them here.

这里我只列出一些睡眠障碍
They're sort of bad things that could happen to you when you're asleep.

它们算是在你睡觉的时候出现的坏事了
One particularly trendy sleep disorder that's been discovered recently

最近发现的一个特别流行的睡眠障碍