As you relax more deeply, you move into NREM-2 stage sleep, as your brain starts exhibiting bursts of rapid brain wave activity called sleep spindles.

当你更加放松，你进入了NREM-2期睡眠，你的大脑开始展现出爆发式的快速脑电波活动，叫做睡眠纺锤波。

For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep the slower your brain waves will be.

在随后约半小时内，你进一步放松，进入第二和第三阶段睡眠。睡眠越深入，脑电波就越缓慢。