Newborn babies may spend more than 80 percent of their total sleep time in REM.

对于大多数被试者，快动期占整个睡眠时间的20%，而新生儿的快动期可达睡眠时间的80%。

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Monday's study from Eastern Virginia Medical School in Norfolk covered 1, 000 people and found that total sleep time decreased as body mass index — a measure of weight based on height — increased.

周一，位于美国弗吉尼亚州诺福克市的东维吉尼亚医学院发布了这份研究。对1000名受试者的研究显示累计睡眠时间和体重指数刚好成反比，体重指数是一种以身高为基准来衡量体重的方法。

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They also recorded sleep habits or disturbances: bad dreams, total sleep time and delays in falling asleep.

他们还记录睡眠习惯或存在的问题：噩梦、总的睡眠时间和晚睡情况。

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Vanda Pharmaceuticals said the trial would last six months and aim to show an improvement in total sleep time.

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They report that while the total time spent asleep remained the same as young adults moved towards middle age, the type of sleep differed.

BBC: Sleep linked to ageing