Deep sleep is associated with slow brain waves, and larks spent 50% more time in such slow-wave sleep 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。

youdao

The brain activity data collected from the volunteers in the sleep group showed that deep sleep (slow-wave sleep) helped strengthen their memories of new words.

从睡觉的那一组志愿者那里收集来的大脑活动的数据表明，深度睡眠(短波睡眠)帮助他们巩固了对词汇的记忆。

youdao

This could be because slow-wave, or ‘deep sleep’, benefits women more than men, the Associated Professional Sleep Societies’ annual conference heard.

这种现象的原因是，女性要比男性更容易从慢波睡眠，也就是“深度睡眠”中获得休息，科学家们在联合专业睡眠协会的年度会议上发布了这一消息。

youdao

Their study shows that as young people grow older they spend less of their sleeping time in slow wave or deep sleep.

BBC: Sleep linked to ageing

First the team showed that they could use the state of a region of the brain, called the medial prefronal cortex, to predict how much deep, or slow-wave, sleep a person would have.

BBC: Boosting sleep 'may slow memory rot'