Using coffee instead of sleeping might lead to sleep problem.

用咖啡代替睡眠可能会导致睡眠问题。

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Fu: It's not like they have sleep problem. They just don't sleep as much.

傅：她们没有睡眠问题，只是睡得不像一般人那么多。

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So the sleep problem has also already aroused people's special attention.

正因如此，睡眠问题也已渐渐引起人们的特别关注。

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So, we have no problem understanding a movie where somebody goes to sleep as a teenager and wakes up as Jennifer Garner, as an older person.

我们完全能够看懂电影中,一个少女睡去,一觉醒来却变成了詹妮弗·加纳,一个成年人

耶鲁公开课 - 心理学导论课程节选

According to a 2011 poll, more than half of Americans between the ages of thirteen and sixty-four experience a sleep problem almost every night, and nearly two-thirds complain that they are not getting enough rest during the week.

NEWYORKER: Up All Night

"Going to sleep is a problem, " she said.

BBC: NEWS | UK | Wales | Editor's ?8.4m headline lotto win

Another growing problem is sleep apnea.

WSJ: More Children With Sleep Problems Seek Overnight Tests