Sleep had two focuses, one for regular, two for enough sleep, sleep as long as these two conditions are met, there is no problem to sleep at night, but only to keep the rest at the same time. So sooner or later as the sleep period can not stay up late specific standard, means staying up late irregular sleep time, sleep e.g. 10:00 day, day but went to bed 2:00; day or 12 hours of sleep, sleeping five hours a day , and long-term lack of sleep is more serious than stay up all night
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