mike_k, The forgotten medieval habit of 'two sleeps'.
(Older article but new to me.)
https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep
mike_k, The forgotten medieval habit of 'two sleeps'.
(Older article but new to me.)
https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep