Ideas & society2013 · shared on Hacker News
doi · j.1365-2869.1992
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Yanigbrowl ·
We used to sleep twice each night
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Yshrumm ·
The medieval habit of ‘two sleeps’
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Ydelanceyplace ·
WE USED TO SLEEP TWICE EACH NIGHT – 6/30/15
2 points1 comments