Before the rise of industry, it was normal for people to sleep in two phases each night.

People had no set bedtimes. Sleeping was determined by whether or not there were things to do. Most people would have a first and second sleep, with a couple of hours awake inbetween. This is probably the way humans are supposed to sleep.

Modern schedules don't really let us do that. Perhaps we should think about changing that.

sciencealert.com/humans-used-t

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@InvaderXan
Might have also come from literally sleeping in shifts to keep watch during the night in tribal society

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