Regardless of being "late sleep" or "early sleep", people should capture their own biological clock and improve efficiency of sleep.

不管是早睡还是晚睡，人们应该更了解自己的生物钟，而使睡眠更有效。

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I the singer of Adamic songs" he said it directly "Through the new garden of the West, the great city is calling, as Adam early in the morning, walking forth from the bower, refreshed with sleep; behold me, where I pass, hear my voice."

我是个为亚当的歌曲吟诵的歌手",他直言不讳地说,"穿越西方新的花园,这个伟大的城市在呼唤,正如亚当在一天清晨,由树荫下走出,睡眠使他精神饱满,看着我走过吧,聆听我的声音"

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Crash factors may include sleep loss, driving patterns -- early morning or late at night, for example, use of sedating medications, untreated or unrecognized sleep disorders, or consumption of alcohol.

CNN: How to combat drowsy driving

Their husbands may be "salarymen" or white collar workers, who leave home in the early hours, and return merely to sleep.

BBC: NEWS | Programmes | This World | Retired husband syndrome

With schools starting early, kids often don't get enough sleep.

WSJ: How Much Sleep Do Children and Teenagers Need? Grown-Up Problems Start at Bedtime