Why do we yawn?

Yawning is a reflex.  Once triggered, there is a sequence of events that are automatically carried out by the body.  We take a deep breath in, open our mouth, and exhale as we sometimes make an audible yawning sound.  Why do we do this?  What is the trigger?  Some think it’s triggered by shallow breathing.  Shallow breathing brings less oxygen into the body, so yawning would bring in more.  We tend to experience shallow breathing when we are bored and uninterested, or when we are tired.  Some people believe the purpose of yawning is to cool your brain.  The act of yawning causes you to open your mouth, close your eyes, and breathe in deep.  This will draw warm blood away from the brain and into the face to help the brain cool down.  What do you think?  Which explanation resonates with you?  Feel free to comment below.

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