This is (sort of like) humans used to sleep until the industrial revolution. Couple of links http://www.livescience.com/12891-natural-sleep.html http://www.live

This is (sort of like) humans used to sleep until the industrial revolution. Couple of links http://www.livescience.com/12891-natural-sleep.html http://www.livescience.com/12891-natural-sleep.html http://www.bbc.com/news/magazine-16964783 http://www.bbc.com/news/magazine-16964783