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TIL that “biphasic #sleep” was the norm pre-industrial-revo, and may even be an primatic evo-biological adaptation.ppl woke up for “the watch” and did misc. things before a 2nd sleep.
Depriving ppl of artificial light re-induced this way of sleeping.
https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep