Healthy people rotate between three states of vigilance: wakefulness, rapid eye-movement (REM) sleep and non-REM sleep.

健康人群会在三种警戒状态下转换：觉醒，快速动眼睡眠，非快速动眼睡眠。

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Dreams occur in both rapid-eye movement (REM) sleep, and non-REM sleep.

在快速眼动（REM）睡眠期和非快速眼动睡眠期都会有梦境生成。

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Vivid, emotional and often very weird dreams are typical of REM (rapid eye movement) sleep, which makes up about 20 per cent of our sleep.

生动逼真的、情绪的以及常常不可思议的梦是快速眼动睡眠阶段的特点，快速眼动睡眠占据了我们睡眠的20%时间。

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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'