During your exam period, you want your brain to work at its very best, so build in relaxation time before bed, avoid late night revision sessions and try to go to bed early so you get enough sleep.

在考试期间，你想让你的大脑处于最佳工作状态，所以在睡觉前安排放松时间，避免深夜复习，尽量早点睡觉，这样你就能得到足够的睡眠。

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The period of time that you are awake adds to something called “sleep drive.

你醒着的时间会增强“睡眠驱动力。”

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By definition polyphasic sleep means you'll be taking multiple naps during a 24-hour period and spending more time awake at night. But you'll also gain several extra productive hours per day.

多相睡眠仅仅意味着你可以通过在24小时内多次小睡来获得一些额外的时间。

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Vacations have been found to help us recharge -- we sleep better during them and for a period of time afterwards.

CNN: Take your vacation, or die?

CommWarrior has been seen in the wild sporadically since the beginning of the year, but contains a sleep function that allows it to lie dormant for an undetermined period of time, which explains why it hasn't yet hit peak distribution.

ENGADGET: CommWarrior cellphone virus smolders, somewhere