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We all do it, and we all know it has at least something to do with how tired we feel. But unlike sleep apnea or laptops in the bedroom, yawning is an aspect of sleep that researchers haven’t quite figured out just yet.

That doesn’t mean we’re totally in the dark when it comes to catching flies. Here are a few of the facts we know for sure when it comes to yawning.

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MARTIN SCHUTT

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Click link below for story and slideshow:

http://www.huffingtonpost.com/entry/why-do-we-yawn_us_56748fa0e4b06fa6887d8947?cps=gravity_7027_-7026177434180530502&kvcommref=mostpopular

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