When we reached home my sleep had lost itself in something still deeper.
我们到家的时候，我的睡眠陷入到更深的境界之中。
Individual dolphins also enter a deeper form of sleep, mostly at night.
个别海豚也会睡得较沉，特别是在夜间。
Night is getting deeper and deeper, it is early morning, and we have no sleep.
夜越来越深了，是凌晨时分了，我们却毫无睡意。
There are four levels of sleep, each being a little deeper…
睡眠分为四种层次，每层都比上层的状态深一点。 …
There are four levels of sleep, each being a little deeper…
睡眠分为四种层次，每层都比上层的状态深一点。 …
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