Sleep 
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SOURCE: The Atlantic
1/27/2022
Does America Need to Return to Medieval Sleep Habits?
Historian Roger Ekrich describes the medieval biphasic sleep cycle – falling asleep at nightfall, waking at midnight, and sleeping again till dawn – but says it was a response to living conditions, not a natural pattern or preferable to modern sleep habits.
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SOURCE: News-Medical.Net
5-17-17
Meet historian Roger Ekirch: Mr. Sleep
His research area? Sleep.
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