There are four levels of sleep,each being a little deeper than the one before.怎么翻译

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Therearefourlevelsofsleep,eachbeingalittledeeperthantheonebefore.怎么翻译Therearefourlevelsofsleep,eachb

There are four levels of sleep,each being a little deeper than the one before.怎么翻译
There are four levels of sleep,each being a little deeper than the one before.怎么翻译

There are four levels of sleep,each being a little deeper than the one before.怎么翻译
睡眠分为四种层次,每层都比上层的状态深一点.