• Question: Why do we yawn when we are tired?

    Asked by Ben to Andy, Duane, Giovanna, Katie, Theresia on 17 Nov 2014.
    • Photo: Theresia Mina

      Theresia Mina answered on 17 Nov 2014:

      When we are tired it is likely that the brain is lacking oxygen. Yawning will help to increase oxygen intake 😀

    • Photo: Duane Mellor

      Duane Mellor answered on 17 Nov 2014:

      It is also a behaviour response, as way of signalling as when one person yawns other people start yawning too

    • Photo: Andrew Philp

      Andrew Philp answered on 18 Nov 2014:

      Some people think that it is to get my oxygen to the brain, others to get more blood flow to the brain. I’m not sure, but i think there more and more research to suggest that its not directly related to tiredness or boredom

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