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为什么入睡这么难？
source link: https://www.v2ex.com/t/620370
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问与答 - @blackbeardd - 据说入睡的前提是 疲惫+放松，前一条满足了，放松却是很难做到，大脑稍微想点儿东西，思维就活跃了。有时候睡着了，但是睡了五六个小时就醒来了，再也睡不着。
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