REM sleep is termed 'active' sleep.

快速眼动睡眠称作“主动”睡眠。

《牛津词典》

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Then there is REM sleep.

第二种就是快速眼动睡眠。

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Then REM sleep emerges, rapid eye movement sleep.

这时就进入REM快速眼动睡眠。

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In the study, 25% of the patients had increased muscle activity during REM sleep.

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This increases your frequency and depth of REM sleep, viewed by experts as the most rejuvenating level of slumber.

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During REM sleep, there is increased brain activity and visual stimulation.

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