大脑,也象全身别的脏器一样,需要有较彻底的休息。睡眠,就是这样的一种休息。人的睡眠有两个不同阶段:慢波睡眠和快波睡眠。人入睡时,先是慢波睡眠,约1.5～2小时,然后转入快波睡眠。快波睡眠也叫快动眼睡眠,做梦、翻身、尿床等,一般都在这个阶段出现,大约持续20分钟左 The brain, like other organs of the body, needs a more thorough rest. Sleep, is such a kind of rest. There are two different stages of human sleep: slow wave sleep and fast wave sleep. People fall asleep, the first slow wave of sleep, about 1.5 to 2 hours, and then transferred to fast wave sleep. Fast wave sleep also called fast eye sleep, dreaming, stand up, bedwetting, etc., are generally at this stage appears, lasted about 20 minutes left