Why people yawn when they are sleepy? Are there any biological reasons behind yawning?
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I can answer this one! A frequent cause of yawning is your brain “Oh fuck I need more oxygen.”-ing mich how coughing or wincing are involuntary reactions, so is a yawn. It’s about getting as much oxygen into a brain deprived of the stuff.
Something else you learned today, asthmatics can break into a yawn if they sing too much for that very reason.
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