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Dear A Moment of Science,
親愛的《科學一科》欄目組：
Why do we sleep?
我們為什么需要睡覺?
I know this question has been debated by scientists and philosophers for centuries, but are there any hard and fast answers?
我知道科學家們和哲學家們就這個問題爭論了好幾個世紀，但現在有沒有確實的，現成的答案?
Good question!
問得好!
First, it's true that scientists have long pondered the mystery of sleep why we do it and why it's necessary.
首先，科學家們長期以來確實在思考睡眠這一謎題，我們為什么需要睡眠，為什么睡眠十分必要?
We know that going without sleep for too long can seriously damage health, so there's good reason to believe that getting enough sleep is important for our well-being.
我們知道長期失眠會嚴重地危害健康，因此，有必要相信保證睡眠充足對健康很重要。
But exactly how and why that's the case is still an open question.
但失眠為什么會影響健康，又是如何影響的，這個問題仍沒有答案。
Some research, though, may shed a little light on the problem.
一些研究也許可以稍稍解答這個問題。
For instance, scientists at the University of Rochester Medical Center in New York did a study with mice, and found that during sleep their brains flush out toxins that accumulate during the day.
比如，紐約羅切斯特大學醫學中心的科學家們用老鼠做了一個研究，發現老鼠在睡覺時，他們的大腦會排除白天積累的毒素。
譯文為可可英語翻譯，未經授權請勿轉載!
