Not to worry!: Interestingly, we still don't really know why we yawn. The obvious reason is because we're tired. There is also a theory that it helps to cool the brain when we over use it! holding in a yawn isn't dangerous. Holding in a sneeze is hard on the system because that increases the pressure in the chest.
Answered 5/6/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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