NREM-3 comes with slow rolling delta waves.

NREM-3期的特点是缓慢的delta波。

And as your sleep deepens, your brain moves to longer delta waves.

随着睡眠的加深，你的大脑会向更长的波移动。

These long-burst brain waves are called delta waves.

这些长时间爆发的脑电波被称为三角波。

After that, you enter the deep sleep phase characterized by a particular pattern in your brain called delta waves.

之后，您将进入深度睡眠阶段，大脑中会出现一种称为 delta 波的特定模式。

We call that stage I. Then you get successively deeper, II through IV, slow, irregular, high amplitude delta waves, and then once you reach stage IV you start going up again, up through stage III and II.

我们称之为第一阶段。 然后你会逐渐深入，从第二阶段到第四阶段， 缓慢、不规则、高振幅的三角波，然后一旦到达第四阶段， 你就会再次开始上升，直到第三阶段和第二阶段。