Passive sleep is also known as slow-wave sleep because the brain wave move in a very slow and regular rhythm, during which the body is at rest, the heart beat slows down and the body progresses become very slow.

• 消极睡眠又叫作慢波睡眠，因为消极水时脑电波处于一种非常缓慢的、有节奏的波动状态，人体处于一种安宁的状态，心脏的跳动减缓，人体机能的运行变得非常缓慢。