Babies sleep for up to eighteen hours a day.People have no idea how important sleep is to their lives.

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• Babies sleep for up to eighteen hours a day.People have no idea how important sleep is to their lives.
• 英语翻译Babies sleep for up to eighteen hours a day.Sleep.No one can live without it.71 Research (研究) by the National Sleep Foundation in Washington says that we all need eight hours' sleep every night.Scientists have found that people who sleep for less than six and a half hours a night are more often ill than people who sleep for eight hours.72 "Workaholics" (工作狂) who sleep for less than five hours often die young,and do less well at work.It also says t
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