2. 外语
  3. Sleep Sleep is part of a person’s daily activity cycle. / There are several different stages of sleep, and they too occur i

Sleep Sleep is part of a person’s daily activity cycle. / There are several different stages of sleep, and they too occur i

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答案 Sleep Sleep is part of a person’s daily activity cycle. / There are several different stages of sleep, and they too occur in cycles. / If you are an average sleeper, your sleep cycle is as follows. /When you first drift off into sleep, your eyes will roll about a bit, your temperature will drop slightly, / your muscles will relax, and your breathing will slow and become quite regular. / Your brain waves slow down a bit, too, /with a rhythm of rather fast waves predominating for the first few minutes. / This is called Stage 1 sleep. / For the next half hour or so, as you relax more and more, / you will drift down through Stage 2 and Stage 3 sleep. / The lower your stage of sleep, the slower your brain waves will be. / Then about 40 to 69 minutes after you lose consciousness / you will have reached the deepest sleep of all. / Your brain will show the large slow waves. / This is Stage 4 sleep.
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