午后的这段时光是人体在白天最倦怠疲乏的时候。从“打个盹”这个短语我们可以知道,小睡其实就是一个在白天很短的、有助于恢复精力的瞌睡。小睡可以持续5分钟到3小时不等,所以它可以包括一个完整的睡眠周期,包括三个阶段。
Your eyes get heavy and gradually... close...
But wait!
It's only lunchtime and you still have so much to do.
Would taking a nap help?
Or would it derail your day?
Our sleep,both at night and in naps, is made up of approximately 90 minute sleep cycles with four stages each.
A nap can last anywhere from five minutes to three hours, so it can include full sleep cycles or just a few stages.
As you fall asleep, you enter Stage 1: the first two to five minutes of sleep.
Stage 2 comes next,for about 30 minutes.
In Stage 2,body temperature drops,muscles relax, and breathing and heart rate become more regular.
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