Cerebrospinal fluid (blue) flows through the brain and clears out toxins through a series of channels that expand during sleep.
上图来自U.S. Department of Health & Human Services, 展现的是睡眠时脑脊液(蓝色)流经大脑,清除毒素的过程。脑脊液并没有自己的流通管道,只能借用血管外壁深入脑组织,因此,只有睡眠时,脑组织收缩,脑脊液才有机会清洁大脑。
睡眠是唯一的大脑清理垃圾的机会。
想像这样一个场景,你生活在一个25平米的胶囊公寓,在这个空间吃喝拉撒还不能出去。如果一周时间里下水道坏了,任何垃圾都无法清理出去,你能生活下去吗?在废物和腥臭的夹击下,你能精神不崩溃吗?
大脑就是那个被恶臭与垃圾淹没,在罢工与窒息边缘徘徊的家伙。
可怜下你的大脑,早点休息吧。
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