why do people yawn??

its weird. does it stretch our muscles before we sleep??

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  • 1 decade ago
    Favorite Answer

    Because we are tired and need more oxygen.

  • 1 decade ago

    Yawning I've learned ahs no physiological effect for our bodies. It does NOT increase the oxygen intake whatsoever, and is more of a human to produce a nonverbal indication of his/her state of being, which is usually being tired or nervousness. There is however no evidence on exactly why we yawn, so these answers are just inferences.

  • 1 decade ago

    Its an attempt theb rain makes to draw more oxygen to it so the brain function better.

  • 1 decade ago

    Check the answers to the same question asked earlier today.

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  • 1 decade ago

    Sleepy.

  • Anonymous
    1 decade ago

    Because they are tired :)

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