Well: From Sleep Study, Clues to Happiness
A brain chemical called hypocretin may help explain why we "fall down" with laughter, and why people with narcolepsy, who lack the substance, get depr...
Source: http://well.blogs.nytimes.com/2013/03/21/from-a-sleep-study-clues-to-happiness/?partner=rss&emc=rss
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