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英语翻译It is clear that sleep is necessary to everyone.Most peo

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英语翻译
It is clear that sleep is necessary to everyone.Most people rarely think about how or why they sleep.However,we know that if we sleep well,we feel rested.If we do not sleep enough,we often feel tired and irritable.It seems there are two purposes of sleep:physical rest our bodies and our minds.Both are important to our health.Each night we havetwo kinds of sleep:active sleep gives our body the rest that it needs,and prepares us for active sleep,in which dreaming appears.And we are beginning to understand the importance of the dream stage in our sleep cycles  Let's look at the two different kinds of sleep.They are quite different.In passive sleep,the body is at rest.The heart slows down.We move very little.And the brain becomes inactive.This stage of sleep is known as slow-wave sleep because the brain waves move in a very slow,regular rhythm.
很显然,睡眠对每个人都是必要的.大多数人很少会去想怎么睡觉或者为什么要睡觉.然而,我们知道,如果我们睡的好,我们会觉得很轻松.如果我们睡眠不足,我们常常会觉得疲劳和烦躁.因此睡眠有两个目的:身体的休息和心理的休息.这两者对我们的健康都很重要.每天晚上我们有两种睡眠状态:活跃的睡眠让我们的身体得到休息,并且为我们准备了积极的睡眠,这时就开始做梦了.我们已经开始意识到做梦的阶段在我们睡眠周期的重要性.让我们来看看两种不同的睡眠状态.他们有很大的不同.在消极的睡眠状态,是身体在休息.心跳就减慢了.我们的生理活动很少.这时大脑就变得活跃了.这个睡眠阶段由于大脑波浪移动处于一种非常缓慢的、有规律的节奏,这就被称为慢波睡眠,