TIL for millennia, people slept in two shifts – once in the evening, and once in the morning. Biphasic sleeping is mentioned as early as the 8th Century BC, and appears to have remained the dominant, natural format up until the Industrial Revolution.

Read more: https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep?ocid=twfut

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