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Deore | 19:39 Thu 27th Mar 2003 | Body & Soul
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Why do we yawn when were tired?
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To increase the oxygen content in your blood.
Was wondering if that old stock answer would come up :-) I don't notice much inrush of air when I yawn, not like deep breathing. And why is yawning 'infectious'? Laughing; you can understand why that can be infectious - it's fun. I think we yawn (like a snarl) as a kind of defence expression due to vulnerability of fatigue but that is a bit thin...
Click http://www.msnbc.com/news/205574.asp?cp1=1 and scroll down to the middle of the page and the paragraph which opens: "The truth is..." for the answer.
My boss asked me the other day why yawning was infectious, and wanting to appear knowledgeable I made up the story that it went back to cavemen sharing a cave, and when they saw someone yawning they too yawned in order to maintain their share of oxygen!! Well it wasn't bad for spur of the moment!!
You also yawn when you are hungry

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