美国国家睡眠基金会称，你的睡眠时间长短很大部分取决于你的年龄。
The National Sleep Foundation suggests that the amount of sleep you need very much depends on your age.
据美国国家睡眠基金会的一项调查显示，约有三分之二的被研究者在工作日晚上睡眠不足。
According to a survey from the National sleep Foundation, roughly two-thirds of people studied do not get enough sleep on weeknights.
根据美国国家睡眠基金会，其它症状是：醒得过早、醒来以后难以再次入睡、经常中途醒来、醒来之后疲惫无力。
The others, according to the National Sleep Foundation are waking up early and not being able to fall back asleep, waking often, and waking up feeling unrefreshed.
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