Why is it so hard to force yourself not to yawn?

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Why is it so hard to force yourself not to yawn?

In: Biology

I yawned while reading this. I think it could be because of the fact that when you’re yawning, you are tired. Since you’re tired, you can’t do anything properly. :/

If you ever feel like you are about to yawn, touch the tip of our tongue to the roof of your mouth and you wont. I do this all the time if I’m face to face with someone or in a social environment and don’t want to be rude.