Matter: Down From the Trees, Humans Finally Got a Decent Night’s Sleep

http://rss.nytimes.com/c/34625/f/640350/s/4c4fab10/sc/32/l/0L0Snytimes0N0C20A150C120C220Cscience0Cdown0Efrom0Ethe0Etrees0Ehumans0Efinally0Egot0Ea0Edecent0Enights0Esleep0Bhtml0Dpartner0Frss0Gemc0Frss/story01.htm

Humans sleep more deeply but for shorter periods than other primates’ habits, a study finds. The pattern may have helped humans evolve more powerful brains.

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