It involves a mask that goes over your eyes that flashes lights or emits a sound when you fall into the REM stage of sleep.

这产品有个面具，可以在你即将进入深层梦境的时候在你的眼部发出闪光，或者弄出一些声音。

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While REM is popularly thought of as the dream stage of sleep, it's not absolutely clear why this sleep stage is important, Dr. Gruber notes.

格茹博说，尽管REM普遍被认为是睡眠的做梦阶段，这个睡眠阶段为何重要的原因尚不是绝对清楚。

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The control group spent about 19 percent of their sleep time in the REM stage, compared to about 17 percent for the ADHD group.

控制组在REM阶段的时间是总睡眠时间的19%，而患有adhd的研究组时间是17%。

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Alcohol reduces how much time we spend in rapid eye movement (REM) sleep - the stage of sleep where dreams generally occur.

BBC: Alcohol-fuelled sleep 'less satisfying'

Excessive alcohol consumption disrupts the 'REM' (Rapid Eye Movement) stage of deep sleep to ruin a night's rest, according to the UK Department of Health.

CNN: Vital Signs health tips