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Warren Capps's avatar

An interesting sidelight on your comments on sleep. In medieval Europe (where the nights were long) there existed the concept of 1st sleep and 2nd sleep. They were usually separated by a couple of hours where, in the middle of the night, you might converse with your neighbors. I first read about it in a Smithsonian Magazine article 30 years ago. Here is an updated article on the subject. https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep

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Kit's avatar

There is an excellent book called 'Second sleep' by Robert Harris. I highly recommend it.

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