Why Do People Yawn When They're Tired?

Yawning is like a brain stretch. When you're tired, your brain slows down, and yawning helps it wake up again. It also makes people around you yawn because of a kind of invisible brain connection we all have.

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Examples

When you're tired after a long day, you start yawning repeatedly.
Your friend yawns during class, and suddenly everyone starts yawning too.
A baby sees their parent yawn and copies them right away.

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Categories: Health · yawning· sleep· brain function· contagious behavior· neurology