Newborn babies may spend more than 80 percent of their total sleep time in REM.
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%。
But the actual net sleep time is only about two hours per day total.
所以其实真正算起来，我每天的实际睡眠只有不到两个小时。
Total darkness tells your brain it's time to sleep.
完全黑暗的告诉你的大脑是时候睡觉。
Total darkness tells your brain it's time to sleep.
完全黑暗的告诉你的大脑是时候睡觉。
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