Sleeping less in old age may be an adaption to surviving in wild

The 'poorly-sleeping grandparent' hypothesis backed with new evidence from Tanzania's Hadza people, links our sleep patterns to having night sentinels

from # All Medicine by Alexandros G. Sfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2u6Bt3r
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