If you work a late shift or travel frequently, your sleep cycles could be off.

如果你的工作时间是在夜里，或者是经常出差，你的生物钟很可能会被打乱。

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New research has found that women tend to have shorter, earlier sleep cycles then men.

最新研究发现：女性比男性的睡眠周期更短、更早，所以女性往往比男性睡得更早、醒得更早。

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The reason for this is sleep-- the repetitions are scheduled to sleep cycles, and there is a fair amount of research to support this.

复述是按睡眠的周期来的。 这个是有很多研究结果支持的。

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Warped or otherwise, I decided to give QS a three-month test drive, downloading Android apps and outfitting myself with devices to track my mood, sleep cycles, calories, location, spending and productivity.

FORBES: Magazine Article

In another experiment the researchers wake up sleeping mice by sending a light signal to the hypothalamus, the brain's controller of sleep-wake cycles.

FORBES: Magazine Article