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What causes constant yawning?

In: Health, Yawning [Edit categories]

Answer:

they say its due to a lack of oxygen to the brain....it happens to me as a result of me being around air conditionin

Well I always yawn when I'm tired, it gives me more energy but it makes me sleepy or when you se someone else yawning constantly!-Icelopbunny

First answer by Lillybug49601. Last edit by Icelopbunny. Contributor trust: 3 [recommend contributor ]. Question popularity: 13 [recommend question].

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