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How Our Ancestors Used to Sleep Twice a Night -
2013-12-20 11:02:40 GMT
"His research found that we didn’t always sleep in one eight hour chunk. We used to sleep in two shorter periods, over a longer range of night. This range was about 12 hours long, and began with a sleep of three to four hours, wakefulness of two to three hours, then sleep again until morning."
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