When your body is low on oxygen, your mouth opens as wide as it comfortably can and tries to suck more air in. Yawning is a way to regulate the amount of carbon dioxide and oxygen in your blood.
Unfortunately, yawns are nearly impossible to stifle. Scientists speculate that the onset of a yawn is triggered either by fatigue or by sheer boredom as, at those times, breathing is shallow, and little oxygen is carried to the lungs by the oxygen-toting cardiovascular system.
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