要经历清醒梦（lucid dream）最简单的办法莫过于训练自己在入睡时对自己发问说，“我正在做梦吗？”
The easiest way to experience a lucid dream is to train yourself to ask, "Am I dreaming?" while you are asleep.
首先，睡眠者在半梦半醒及不同调节机制之间转换时进入睡眠状态，呼吸可能短暂地停止或减少。
First, there may be a brief cessation or reduction of breathing when falling asleep as the sleeper waxes and wanes between sleep and wakefulness and their differing control mechanisms.
我们的大脑似乎对此很清楚，在我们进入睡眠时不断练习对危急情况的反应。
Our brains seem to know this and practice responding to threatening situations while we sleep.
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