From diary entries and other personal accounts from the 18th and 19th centuries, sleep scientists have reached the conclusion—that the average person used to sleep about 9.5 hours a night.

从18世纪和19世纪的日记和其他个人记录中，睡眠科学家已经得出结论——人的平均睡眠时间约为每晚9.5小时。

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If Steel was routinely sleeping for four hours a night, she would be drastically underestimating the negative impact, says Alison Gardiner, founder of the sleep improvement programme Sleep station.

睡眠改善项目“睡眠站”的创始人艾莉森·加德纳说，如果斯蒂尔通常每晚只睡4个小时，她就大大低估了其负面影响。

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These kinds of watches are used in sleep studies as a way of measuring how long people are sleeping, how efficient the sleep is, and whether they are waking up in the night.

这些类型的手表在睡眠研究中被用来测量人们的睡眠时长、睡眠效率，以及他们是否在夜间醒来。

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Adults should try to get seven to eight hours of sleep a night.

VOA: special.2010.06.09

But think of the various periods during the night in which you are in a deep, deep dreamless sleep.

但请设想你处在这样的夜晚,你处于熟睡，安枕无梦。

耶鲁公开课 - 死亡课程节选

because I sleep in a different place every night, so yeah!

因为我每晚都在不同的地方睡觉，好啊！

选择美术的原因 - SpeakingMax英语口语达人

For the study, very short sleep patterns were defined as less than five hours a night, short sleep was five to six hours a night, standard sleep was seven to eight hours, and long sleep was nine or more hours a night.

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Study subjects who had less than seven hours of sleep were at greater risk than those who got eight hours of sleep a night.

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The competitors take turns sleeping in a shared single bed and get little more than five hours of sleep a night if they're lucky.

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