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- #1
8 hours of sleep is not natural:
http://www.bbc.com/news/magazine-16964783
This one talks about different sleeping patterns:
http://www.highexistence.com/alternate-sleep-cycles/
http://www.bbc.com/news/magazine-16964783
This one talks about different sleeping patterns:
http://www.highexistence.com/alternate-sleep-cycles/