Nearly two thirds of the teenagers with short sleep duration also had low sleep efficiency.

将近三分之二短睡眠时间的青少年也有睡眠效率也降低。

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According to a survey from the National sleep Foundation, roughly two-thirds of people studied do not get enough sleep on weeknights.

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。

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Baby will spend two-thirds time in deep sleeping, so a good pillow can not only help baby in a deep sleep, but also protect the baby and his dedicated head.

婴幼儿三分之二的时间在睡眠中度过，一款好的枕头，不仅可以帮助宝宝进入深度睡眠，同时还可以呵护宝宝娇嫩的头形。

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According to a 2011 poll, more than half of Americans between the ages of thirteen and sixty-four experience a sleep problem almost every night, and nearly two-thirds complain that they are not getting enough rest during the week.

NEWYORKER: Up All Night

Two-thirds of the study participants reported at least one hour's difference in their average weekday and weekend sleep schedules, and more than 10% reported three-plus hours.

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