what is the reason of continous yawning.?
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We yawn when we're tired. We yawn when we're bored.Yawning can be useful for alleviating pressure in the eardrums.Vasovagal reaction is the scientific term for excessive yawning. The reaction is caused by the action of a nerve, appropriately called the vagus nerve, on the blood vessels. Vasovagal reaction is commonly associated with heart problems, which could be very serious.
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