What we do know is that people tend to have different kinds of nightmares at different points during the sleep cycle.

我们现在所知道的就是，人们在睡眠周期的不同阶段往往会做不同类型的噩梦。

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Blood pressure usually falls during the sleep cycle.

血压通常在睡眠周期中降低。

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And what we remember or learn varies throughout the sleep cycle.

我们的所记所学贯穿整个睡眠周期变化着。

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To use the Sleep Cycle app, you set the alarm and lay the iPhone face down on your bed.

WSJ: Smart Alarms Decide When You Should Really Wake Up

In narcolepsy, the sleep cycle goes haywire.

FORBES: Magazine Article

In a company-funded study published last year in the Journal of Sleep Research, the Zeo predicted the same sleep cycle as professional sleep equipment in a lab about 75% of the time, compared with 86% agreement for two independent professional lab measures with each other.

WSJ: Smart Alarms Decide When You Should Really Wake Up