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我们睡着时会不会作梦，其实跟周围的环境温度大有关系，这要先讲到一个没太多人知道的东西： 「黑色素聚集激素神经元」（简称 MCH）。这个专门负责作梦及遗忘的神经元，只在你睡着以后的快速动眼期上工，而科学家发现，当周遭温度变得舒服时，MCH神经元就会被活化，并延长作梦时间，反之，当周遭温度太热或太冷时，这个神经元就会开始罢工，害你做不了梦。这可能是因为动脑和维持体温，对身体来说都很耗能，没办法同时兼顾，而基于「先不伤身体，再讲求效果」的道理，维持体温这项任务，肯定优先于动脑（太热太冷是真的会死，太笨不会）。因此太热太冷时，不只无法思考，就连睡着以后也会无法作梦。
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