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。
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.
没有遵守推荐夜间睡眠时间九小时或更长时间的青少年，平均睡眠时间为7小时53分钟。
The average sleep duration was seven hours and 53 minutes, against the nine or more hours of nightly sleep recommended for adolescents.
在实验开始前的两个晚上，规定志愿者们睡满10小时。期间，他们的平均睡眠时间为8.47小时。
For two nights before the start of the experiment, all participants were allowed 10 hours in bed during which they got an average of 8.47 hours sleep.
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