我们睡眠最好的时间是在九岁和初潮期。

“The best sleep we ever get is between age nine and menarchy, ” she adds ruefully.

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对于大多数被试者，快动期占整个睡眠时间的20%，而新生儿的快动期可达睡眠时间的80%。

Newborn babies may spend more than 80 percent of their total sleep time in REM.

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对于大多数被试者，快动期占整个睡眠时间的20%，而新生儿的快动期可达睡眠时间的80%。

Newborn babies may spend more than 80 percent of their total sleep time in REM.

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