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Is there a medical explanation for yawning?

1 doctor weighed in
Dr. Kenneth Cheng
Family Medicine

In brief: High carbon dioxide

Back in medical school, it was explained to me that as we get tired our respiratory rate goes down raising our carbon dioxide level.
This rise causes us to yawn and take a deep breath to expel the rising carbon dioxide. It sounded good to me at the time.

In brief: High carbon dioxide

Back in medical school, it was explained to me that as we get tired our respiratory rate goes down raising our carbon dioxide level.
This rise causes us to yawn and take a deep breath to expel the rising carbon dioxide. It sounded good to me at the time.
Dr. Kenneth Cheng
Dr. Kenneth Cheng
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