A period of relative alertness, part of the body's circadian rhythm, may explain why some wake up in the middle of the night.
Source: http://www.nytimes.com/2014/01/14/science/a-mental-alarm-clock.html?partner=rss&emc=rss
A period of relative alertness, part of the body's circadian rhythm, may explain why some wake up in the middle of the night.
Source: http://www.nytimes.com/2014/01/14/science/a-mental-alarm-clock.html?partner=rss&emc=rss
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