why is yawning contaguous?!
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Well, I don't know why yawns are contagious because scientists really don't know what cause yawn's in the first place. However, on a lesser level, I believe yawns are contagious because when you see someone yawn, you tend to think of how tired you are. Therefore, you yawn too. And plus it is pretty amusing when you have a yawn fest with someone and just cannot stop yawning back and forth.
Hope this helps!
Other Answers:
The truth is, nobody knows why.
Yawning happens when you need more air. Yawning is contagious because technically, you're stealing other people's air, and then they need the air, and then they yawn, and more air is stolen, and then more people yawn.
Yawn contagion is largely unconscious. Wherever it might affect the brain, it bypasses the known brain circuitry for consciously analyzing and then not mimicking other people’s actions.
We can see someone yawn, yearn to replicate the action ourselves, and do it, all without thinking about it. That and the power of suggestion from seeing one person do it is enough to push everybody else over the edge.
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