The delta rhythm will disappear, to be replaced by the activity pattern of brain waves.

δ节奏消失，并被脑电波的运动图形取代。

In healthy brains, these waves are very consistent — for instance, during normal waking activity, your brain produces a pattern called the beta rhythm, and, in deepest sleep, it generates a slower delta rhythm.

在健康的大脑中，这些波是非常一致的——例如，在正常的清醒活动中，您的大脑会产生一种称为 beta 节律的模式，而在最深的睡眠中，它会产生一种较慢的 delta 节律。

Then about 40to 69 minutes after you lose consciousness you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta rhythm.

大约在开始睡眠后的40到60分钟，你将进入沉睡状态。这时的脑电波表现为巨大的缓波，被称为δ节奏。