After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the activities of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day.
There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to the other.
Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly (although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.
If you have trouble falling asleep, some people recommend breathing very slowly and very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion. Other people believed that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will put you to sleep!
參考答案:繁忙的工作了一天之后，身体需要休息。睡眠对于保持身体健康是非常有必要的。在睡眠过程中，身体会从白天活动的劳累中恢复。睡眠时的休息能使你的身体为明天的活动做好准备。
睡眠有四个级别，逐级加深。 一旦进入睡眠状态，肌肉逐渐放松。心跳减缓，大脑反应变慢。 睡眠达到第四级别后，会自动变换回到第一级别，并逐级变化。
尽管大脑反应变慢，但却是会一直做梦的。研究梦境的科学家称，当处于做梦状态时，眼球变得移动的越来越快，（尽管你的眼睛是一直闭着的）。
这种状况叫“REM”，也就是“眼球快动睡眠”。
如果你有难以入睡的麻烦，人们会推荐缓慢呼吸、深呼吸，也有的人认为喝点热牛奶更容易使你昏昏欲睡。这里还有一个老办法。，数羊也能带你进入梦乡。
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大体翻译了一下，个别地方为了汉语的通顺给改了一点。
可能楼主是一点点抄上的，里面有个别单词写错了。
先这样吧，记得要给我分啊！！！
HOHO
