what causes someone to yawn?!
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It is the brain requiring more oxygen. Which is why when someone else yawns you do to, it is your brain making sure that it has enough in case the other person takes it all. Not very likely to happen unless in a confined space, but the brain is always on survival mode.
Other Answers:
pandiculation has been atributed to talking about it or observing somebody else doing it. It was also thought to be a method of getting air into a tired body, but in reality nobody knows why we do it or what purpose it serves apart from you using it as an expression of boredom..
I beleive I heard once that it is because of a lack of oxygen in the brain.
Somebody yawning near you makes you yawn.
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