The medieval habit of 'two sleeps'(bbc.com)
bbc.com
The medieval habit of 'two sleeps'
https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep
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https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep
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