Scientists have identified various stages of sleep.
科学家们已经可以识别不同的睡眠阶段。
There are several different stages of sleep, and they too ur in cycles.
有几个不同阶段的睡眠，和他们也发生在周期。
It's known that levels of growth hormone rise during certain stages of sleep.
在睡眠进行的一定阶段的时候，生长类的激素就会上升。
It's known that levels of growth hormone rise during certain stages of sleep.
在睡眠进行的一定阶段的时候，生长类的激素就会上升。
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