Why do we yawn?

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  1. Alistair Olver profile image66
    Alistair Olverposted 5 years ago

    Why do we yawn?

    We all do it, but what is the purpose of yawning?

  2. MickS profile image69
    MickSposted 5 years ago

    Because someone has so bored us that we need to breathe deeply to get extra oxygen to keep us awake.

  3. profile image0
    Proud Footposted 5 years ago

    It's completely involuntary, we do it even before we are born and boredom and drowsiness can be the cause but it's also a social thing. Hense the whole yawn chain thing.
    I also read somewhere that it's a mini orgasm, but I'm sure I had dodgy sources, so lets not go into that...
    We often yawn in groups so maybe it's something to do with excess carbon dioxide?
    Ok I'll admit I have no idea, it's interesting though.

  4. peachpurple profile image81
    peachpurpleposted 5 years ago

    feeling too tired of sitting the same position and lack of sleep. Sometimes, looking at the notebook screen for hours make me yawn too, guess it must have been tired body parts, getting the stress out

  5. lburmaster profile image80
    lburmasterposted 5 years ago

    Some believe it is to get more air in our system. Lack of oxygen. But there are many different theories.

  6. CrescentSkies profile image88
    CrescentSkiesposted 5 years ago

    We do it because our bodies temporarily "forget" how to breathe when we're tired.

  7. Vacation Trip profile image70
    Vacation Tripposted 5 years ago

    Its just a symbol of feeling tired and sleepy.

  8. profile image0
    JThomp42posted 5 years ago

    The most plausible explanation, and the one that is taught in medical school, is that we yawn because oxygen levels in our lungs are low. Studies have shown that during normal, at-rest breathing, we don’t use anywhere near our lung capacity; for the most part, we just use the air sacs at the bottom of the lungs. If the air sacs, called alveoli, don’t get fresh air, they partially collapse and the lungs stiffen a bit. As a result, it’s believed, our brain prompts the body to either sigh or take a yawn to get more air into the lungs.

 
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