Dr. Jen Caudle explains the reasons we yawn and why it seems contagious. She describes yawning as the body “running the air conditioning in your head.” Here’s how it happens: “Yawning stretches your jaw, increasing blood flow in your neck, face and head. Then a deep breath sends a rush of cool air to the spinal fluid and the brain.”
This video was originally published on Yahoo Life on Dec. 2, 2022: yhoo.it/3HSppaW
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