Deep sleep is associated with slow brain waves, and larks spent 50% more time in such slow-wavesleep than owls did.
睡眠之深与否与慢波有关,而百灵鸟型处于慢波睡眠的时间比夜猫子型多50%甚至更多。
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The brain activity data collected from the volunteers in the sleep group showed that deep sleep (slow-wavesleep) helped strengthen their memories of new words.