If the irritation is severe enough, a sleeping person will arouse, clear the airway, then resume breathing and likely return to sleep.

如果刺激足够剧烈，睡着的人就会醒来并清理气道，恢复呼吸，并很可能再度陷入睡眠中。

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These kinds of watches are used in sleep studies as a way of measuring how long people are sleeping, how efficient the sleep is, and whether they are waking up in the night.

这些类型的手表在睡眠研究中被用来测量人们的睡眠时长、睡眠效率，以及他们是否在夜间醒来。

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Soon she discovered her sleeping friend, and heard the grandfather's cheery voice, "How did you sleep?"

很快她发现了正在睡觉的朋友，听到了祖父和蔼可亲的声音，“你睡得怎么样？”

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For instance, AstraZeneca's (nyse: AZN - news - people ) Seroquel is often used for its sleep-promoting or calming effect. (see: " Antipsychotic Prescribed as Sleeping Pill") Eli Lilly 's (nyse: LLY - news - people ) Zyprexa has even been used in rare cases in patients with anorexia--one of the drug's potential side effects is weight gain.

FORBES: When Doctors Go Off-Label

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