Most people require between 7 and 8 hours each night. If needed, set a bedtime reminder alarm on your alarm clock.

大多数人每晚需要7-8小时睡眠，如果需要的话，在你的闹钟上设置一个睡前提醒闹铃。

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A special alarm clock was born.

一种特殊的闹钟诞生了。

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Thus time and time's relativity are measurable by any hourglass, alarm clock, or atomic clock that can measure a billionth of a second.

因此，时间和时间的相对性可以用任何沙漏、闹钟或原子钟来测量，其中原子钟可测量出十亿分之一秒。

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Revelations waited for them like all the silent seconds on a digital alarm clock before the shrieking starts or else like a land mine.

NPR: Excerpt: 'Estrellas y Rascacielos'

Their going to spend nine nights together, during wich they discover that sometimes all one needs to approach perfection is a saxophone and a broken alarm clock.

UNESCO: Culture

The cozy, 4-square-meter Sleepbox contains a maximum of three bunk beds, bedside tables, electrical outlets, and reading lamps and can be equipped with a television and alarm clock.

CNN: Airports' tiniest hotels: Sleeping in a box