【美音】睡眠的秘密

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Sleep. It's something we spend about a third of our lives doing, but do any of us really understand what it's all about?
睡眠占用了我们一生三分之一的时间，但是真正有人知道它到底是怎么回事吗？

Two thousand years ago, Galen, one of the most prominent medical researchers of the ancient world, proposed that while we're awake, our brain's motive force, its juice, would flow out to all the other parts of the body, animating them but leaving the brain all dried up, and he thought that when we sleep, all this moisture that filled the rest of the body would come rushing back, rehydrating the brain and refreshing the mind. 
两千年前，古时候的名医伽林提出当我们醒着的时候，我们大脑的原动力，它的液体会流动到身体所有其他部位，维持它们的活力，但这却使大脑枯竭。并且他认为，在我们睡觉的时候，这些充满了我们身体其他部位的液体，会再回到我们的大脑，为大脑补充水分，并且使我们更有精神。

Now, that sounds completely ridiculous to us now, but Galen was simply trying to explain something about sleep that we all deal with every day. See, we all know based on our own experience that when you sleep, it clears your mind, and when you don't sleep, it leaves your mind murky. But while we know a great deal more about sleep now than when Galen was around, we still haven't understood why it is that sleep, of all of our activities, has this incredible restorative function for the mind.
虽然这些观点如今我们听来很荒谬，但是伽林很好的解释了那些，我们每天都要面对的睡眠的事情。那么，根据自身的经验我们都知道，如果我们睡觉了，我们的头脑会变的清醒。而如果我们没有睡觉，大脑就会变糊涂 。我们现在对睡眠的了解比伽林那个时期多了很多，但是我们仍然不知道为什么在我们所有的活动中，只有睡眠有如此这般可以促使我们头脑变得清晰的功能。

……

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