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Why is yawning contagious? Why do you yawn when tired?

  1. anatomynotes profile image90
    anatomynotesposted 3 years ago

    Sometimes I find myself yawning when people yawn. Why is that? Why do people yawn when tired? After reading this you will probably yawn at least once. Please let us know if you did and/or provide your input on yawning.

    1. innerspin profile image88
      innerspinposted 3 years ago in reply to this

      I actually yawned when reading your question headline! I think yawning is something to do with getting more oxygen into your sysytem. Will have to go and google it now, if I can stop yawning.....

  2. HoneyAllen profile image61
    HoneyAllenposted 3 years ago

    It's the body mechanism to vent out the excessive carbon di oxide accumulated in the lungs and to inhale more of the oxygen in the lungs. It signifies lack of interest in the subject under consideration and the fatigues of the brain which demand more oxygen, so people yawn.

  3. Rochelle Frank profile image88
    Rochelle Frankposted 3 years ago

    Yes-- I yawned when I read the subject--- but it is near my bedtime, and I have had a busy day... and my dog is yawning too.