One study reports that people who sleep 5 hours or less per night generally weigh more than those who get a 7-hour sleep.

一项研究表明每天睡眠小于5小时的人比7小时的人更容易长胖。

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In the study, the researchers kept animals awake for 20 hours per day followed by a four-hour sleep opportunity, over five consecutive days.

在这项研究中，研究人员让动物每天清醒20小时，然后给4小时时间睡眠。

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In the study, the researchers kept animals awake for 20 hours per day followed by a four-hour sleep opportunity, over five consecutive days.

在这项研究中，研究人员让动物每天清醒20小时，然后给4小时时间睡眠。

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