Dr. Sasaki found, as expected, the participants slept less well on their first night than they did on their second, taking more than twice as long to fall asleep and sleeping less overall.

佐佐木教授发现，正如预期的那样，参与者们在第一晚的睡眠质量不如第二晚，入睡所需时间是第二晚的两倍多，且总体睡眠时间也更少。

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Men slept an average of 27 minutes less than women and overweight and obese patients slept less than patients with normal weights it said.

该研究显示男性的睡眠时间平均比女性少27分钟，而肥胖病人比正常体重的病人睡眠时间少。

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They compared the alertness of people who slept eight hours a night to that of people who slept less but took a nap during the day. Both groups were equivalent.

他们将晚间睡8小时者的敏锐性与晚上少睡但白天午睡者的进行比较，结果两组相等。

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Last August,a study in the journal Sleep Medicine said children who go to bed after nine o'clock took longer to fall asleep and slept less.

VOA: special.2010.06.09

They also exercised more, smoked less, woke up earlier, slept less and drank more coffee than the non-leaders.

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"People who slept less than seven hours were about three times more likely to get a cold than people who slept eight hours or more a night, " said Sheldon Cohen, psychology professor at Carnegie Mellon University, in a podcast.

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It has even been suggested that the link may hark back to prehistoric times, when humans stored up on fat during the summer months when food was plentiful and they slept less as a result of the shorter nights.

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