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Segmented sleep sounds trendy, but it's not a new idea. In pre-industrial times (and before electricity) it was normal to get up for a couple of hours in the middle of the night. People spent the free time praying, smoking, having sex, or even visiting their neighbors, then went back to sleep until morning.
Since I don't pray, smoke, have sex or visit my neighbours in the middle of the night I have to make do with digital alternatives .....