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Asked by slmg to David on 20 Jun 2011.
Question: why do we yawn
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David Corne answered on 20 Jun 2011:
When we get tired, it’s partly because we are not dealing efficiently with the oxygen in our bloodstream – so the body wants to grab more oxygen. Opening your mouth really wide is a way to get more oxygen quickly.
Comments
slmg commented on :
then why do we yawn when somone else near us has just yawned
David commented on :
someone else asked that, and I answered here:
/nickelj11-zone/2011/06/why-is-yawning-contagious