Throughout the night, people alternate between passive and active sleep.

整个夜晚，人们被动和主动之间轮流睡觉。

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Each night we alternate between two kinds of sleep: active sleep and passive sleep.

每间两种睡眠：主动和被动睡眠晚上我们轮流睡觉。

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The passive sleep gives our body the rest that's needed and prepares us for active sleep, in which dreaming occurs.

被动睡眠使我们的身体休息，我们需要准备主动睡眠，其中做梦发生。

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