評(píng)論
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It's such a commonplace event that you probably never asked yourself why you sleep.
睡覺(jué)是個(gè)特別自然的事兒，你大概從來(lái)沒(méi)有問(wèn)過(guò)自己為什么會(huì)睡覺(jué)。
But from a scientific point of view, this is far from a mundane matter --
但是從科學(xué)的角度來(lái)看，這是很神秘的一件事。
in fact, for sleep researchers, it's one of the biggest unanswered questions in the field.
而事實(shí)上，對(duì)于睡眠研究人員來(lái)說(shuō)，這仍是該領(lǐng)域中一個(gè)懸而未決的問(wèn)題。
Stop and think about it for a second. Why should we sleep? Is it because we get tired?
停下來(lái)仔細(xì)想想。我們?yōu)槭裁磿?huì)睡覺(jué)?是因?yàn)槲覀兝哿藛?
But we sleep every night, even when we have had plenty of rest.
但是即使我們休息夠了，晚上還是要睡覺(jué)。
Further more, if you were designing an animal, would you have it lapse into prolonged periods of unconsciousness every twenty-four hours?
此外，如果讓你設(shè)計(jì)一種動(dòng)物，你會(huì)讓它每24小時(shí)陷入無(wú)意識(shí)狀態(tài)一段時(shí)間嗎?
Shouldn't that put it at a terrible disadvantage?
那不是讓它處于很大的劣勢(shì)嗎?
There are no doubt several different answers to this question, but let's just consider one overall purpose sleep may fulfill:
毫無(wú)疑問(wèn)針對(duì)于這個(gè)問(wèn)題會(huì)有很多不同的答案，但我們單去考慮一個(gè)能夠?qū)崿F(xiàn)的整體目標(biāo)：
sleep as a survival strategy.
睡覺(jué)是一種生存策略。
Human beings are "diurnal" creatures.
人類(lèi)都是白天活動(dòng)的。
That means we are normally active during daylight hours, when our senses function most effectively.
那意味著我們通常是白天活動(dòng)力比較強(qiáng)，那個(gè)時(shí)候我們的感官功能也是最有效率的。
譯文來(lái)自可可英語(yǔ)
