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Thread: When do we yawn

  1. #1 When do we yawn 
    Forum Sophomore Hymenophyllum's Avatar
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    May 2013
    Somewhere over the rainbow
    When do we yawn? I was told many things like when we are out of oxygen, when we are sleepy, but what's the truth?

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  3. #2  
    Goddess of Eternity rmbettencourt's Avatar
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    Apr 2014
    Beverly Hills
    From what I recall, it was believed to be due to oxygen levels for the brain. Like each "type" of yawn is linked to either having too much oxygen or too little. I think studies suggest that it is due to cooling the brain. We also have to equate the psychology behind yawning because we see others do it as well. I too would like to know the TRUE reason behind it, seeing there is one.

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  4. #3  
    Moderator Moderator
    Join Date
    Nov 2011
    city of wine and roses
    There's no real scientific agreement on yawning - which might be a consequence of there not being enough science about fatigue, sleepiness and the like.

    I'm not so sure about the psychology side, though. Exactly the same thing happens with coughing. There's quite a lot of shame and guilt when you're the first one to cough in church or during an intense moment in a theatrical performance. From attentive silence straight into shuffling, coughing, fiddling about for tissues and cough lozenges, the mood is broken. Same thing for laughter. The only reason we don't concentrate on that is because it's usually welcome.
    "Courage is what it takes to stand up and speak; courage is also what it takes to sit down and listen." Winston Churchill
    "nature is like a game of Jenga; you never know which brick you pull out will cause the whole stack to collapse" Lucy Cooke
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