It's contagious because we don't know what yawning is for, and therefore we all want to get in on being mysterious.
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we yawn either because we are tired or hungry
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You're missing the point. How exactly does yawning treat or alleviate tiredness? Get biological here.
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I'll try and figure it out
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You'll need a lab and specimens and expensive equipment. Hope you can get it all together.
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@KevinPaulGregg@i_otaku_potato We yawn due to a lack of oxygen, usually caused by shallow breathing due to fatigue and/or sleepiness. -
so while yawning it helps us to bring more oxygen and remove more carbon dioxide.
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But if it's just a need for more oxygen, why not just have us take a deeper breath? Why that wide open mouth strain thing?
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-would all get sleepy. It was a way to coordinate our biological clocks.
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-and one yawn would trigger the whole tribe to yawn, since we're herd animals. Yawning triggers melatonin, and the tribe-
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the reason yawns are contagious is because, back in our Paleo days, a yawn indicated that a member of the tribe needed sleep-
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good thing it isn't boners
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