why do we yawn when we are tired?

why do we yawn when we are tired?
One is that when we are bored or tired, we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.
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More questions like: why do we yawn when we are tired?
Is yawning a sign of fatigue?
Although not fully understood, yawning appears to be not only a sign of tiredness but also a much more general sign of changing conditions within the body. Studies have shown that we yawn when we are fatigued, as well as when we are awakening, and during other times when the state of alertness is changing. Mar 20, 2002
More questions like: Is yawning a sign of fatigue?
What is excessive yawning a sign of?
Yawning excessively can occur when you are tired, weary or drowsy. Some medications, such as those used to treat depression, anxiety or allergies, can cause excessive yawning. Yawning excessively may be related to a lack of sleep caused by a sleep disorder, a change in daily habits, or a change in work hours.
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Why do I keep yawning when I'm not tired?
Although excessive yawning is usually attributed to being sleepy or bored, it may be a symptom of an underlying medical problem. Certain conditions can cause a vasovagal reaction, which results in excessive yawning. During a vasovagal reaction, there's increased activity in the vagus nerve.
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Why do we yawn when someone else does?
What is known is that the behavior is contagious. The likelihood of yawning increases sixfold, according to one study, after seeing someone else yawn. As for yawn contagion, Giordano said it may be related to a phenomenon called social mirroring, where organisms imitate the actions of others. Jul 17, 2018
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