So how can they sleep and not drown?
那么它们是怎么睡觉而不会溺死呢？
It makes an enormous amount of difference how much sleep I have and how regularly: when I am unwell my sleep patterns go completely to pot and they can take months to stabilise after a bad episode.
对我来说，睡眠时间的多少和多久才能有正常的睡眠是两个完全不同的概念：当我发病时，睡眠全乱了套；经过一个糟糕的发病周期后又需要数个月的时间让睡眠恢复正常。
Still, scientists hope that by studying short sleepers, they can better understand how the body regulates sleep and why sleep needs vary so much in humans.
尽管如此，通过研究短睡者，科学家希望能更好地理解人体是如何调节睡眠的，以及为何不同的人对睡眠的需求会如此不同。
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