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。
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。
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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