他们发现，脑干中的某些细胞只在快速眼动睡眠阶段才产生电化学信号。
They found that some cells in the brain stem produce electrochemical signals only during REM sleep.
在非快速眼动睡眠期的更深层阶段，脑活动较慢一点。
In the deeper stages of non-REM sleep brain activity is slower.
在非快速眼动睡眠期的更深层阶段，脑活动较慢一点。
In the deeper stages of non-REM sleep brain activity is slower.
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