Why is yawning contagious?


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Most Helpful Girl

  • Because when someone does it, it reminds you just how tired you actually are... I guess.

    The word itself made my yawn a bit just now.

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Most Helpful Guy

  • Human evolution, it was to signify that the lookout was tired, and the lookout being tired would mean that he/she couldn't sense any danger, so it was safe to sleep. It was contagious so that the message would spread throughout the group.

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