It's no surprise, then, that more than half of American adults don't get the 7 to 9 hours of shut-eye every night as recommended by sleep experts.

因此，超过半数的美国成年人没有按照睡眠专家的建议每晚合起眼睛睡7到9个小时，就不足为奇了。

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Some 40% of Americans get less than 7 hours of shut-eye on week nights.

大约40%的美国人在工作日晚上的睡眠时间不足7小时。

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That means people trying to invite a massive number of people to the service will probably get their invitation privileges shut off, he said.

那意味着人们试图邀请大量的朋友使用这个服务将会让他们的邀请权限被关闭，他说。

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I'd get seven hours of shut-eye a night because a six-year, large-scale population study of sleep done at the University of California, San Diego School of Medicine associated it with the lowest death rate among adults.

CNN: Healthy habits: A month of living perfectly

Astronauts generally get about six hours of shut-eye in orbit despite being allowed 8.5.

MSN: Space station to get new insomnia-fighting light bulbs

Far from being bland and medicinal, the interior of the bus features a flat-screen TV, a lounge area and four private bunks to get a few more minutes of shut-eye.

BBC: Hangover help from a Las Vegas bus