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2014考研英语必背范文：睡眠的进化
以下《2014考研英语必背范文：睡眠的进化》由留学群考研英语作文频道为您独家提供，欢迎大家参考。
Evolution of Sleep
Sleep is very ancient. In the electroencephalographic sense we share itwith all the primates and almost all the other mammals and birds: it mayextend back as far as the reptiles.
There is someevidence that the two types of sleep, dreaming and dreamless, depend on thelife-style of the animal, and that predators are statistically much more likelyto dream than prey, which are in turn much more likely to experiencedreamless sleep. In dream sleep, the animal is powerfully immobili...
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