But it's not just awkwardness-doctors now know that teenagers' body clocks go through a shift during puberty, meaning they find it hard to sleep before 11 p.m. and hard to wake in the morning.

但这并不尴尬——现在医生知道青少年的生物钟在青春期会经历一个转变，也就是说他们发现晚上11点之前很难入睡，而早晨的时候又很难醒来。

youdao

The scientists believe that our ‘work hard, play hard’ society encourages us to sacrifice sleep and compromises our health.

科学家们称，被不少人奉行的“努力工作、拼命玩乐”的生活原则是以牺牲睡眠和健康为前提的。

youdao

The scientists believe that our 'work hard, play hard' society encourages us to sacrifice sleep and compromises our health.

科学家们称，被不少人奉行的“努力工作、拼命玩乐”的生活原则是以牺牲睡眠和健康为前提的。

youdao

Armah says he's figured out how to get through the hard day. "The best thing for you to do is to go and sleep, and you'll not feel very hungry,".

VOA: standard.2009.09.26

The 1GB of integrated flash memory is a nice touch, but it's not a substitute for the complete inabilty to access the laptop's hard drive when the unit is off or in sleep mode.

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Sleep has also been hard to come by the couple.

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"Sorry, when I don't get much sleep, it's hard to speak in the morning, " he said, coughing.

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