超过40%的初三学生因为学习，每晚的睡眠时间不足8小时。
Over 40% of the Junior 3 have less than eight hours' sleep each night because of study.
随着时间的推移，睡眠不足会让人更加容易生病，尤其是深度睡眠和快速眼动睡眠时间不足时。
Over time, not having enough sleep—especially deep and REM sleep—can cause one to become sick more easily.
大约40%的美国人在工作日晚上的睡眠时间不足7小时。
Some 40% of Americans get less than 7 hours of shut-eye on week nights.
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