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A recent survey in Beijing shows that many middle school students suffer from a lack of sleep.
北京最近的一项调查显示，许多中学生睡眠不足。
Scientists suggest that junior high school students should sleep at least nine hours a day and senior high school students no less than eight hours.
科学家建议，初中生每天应该睡至少9个小时，高中生不少于8个小时。
However, many students cannot get enough sleep.
然而，许多学生不能得到足够的睡眠。
Therefore, they might fall asleep in class or while doing their homework.
因此，他们可能会在上课或做作业时睡着。
So it is not surprising that they get lower grades than those who get enough sleep.
因此，他们比那些睡眠充足的人成绩更差也就不足为奇了。
Many students are short of sleep because they have heavy workloads, poor study habits, or long commuting time, according to an expert.
据一位专家介绍，许多学生睡眠不足是因为他们的学习任务重大，学习习惯不佳，或者通勤时间过长。
Also, many students have either a telephone or a computer in their bedroom.
而且，许多学生的卧室里都有一部电话或一台电脑。
As a result, they hardly go to sleep before 11:00 p.m., but they have to get up early to go to school.
因此，他们很少在晚上11点之前睡觉，但是他们不得不早起去上学。
