You do realize that every one reading this will now be yawning!Why does that happen?
To answer your question i think its something to do with the fact that when you yawn you take a deeper breath in order to ward off tiredness
And the really weird thing is I yawned as I read your question! Does that mean reading about a yawn is the same as seeing someone yawn and then yawning yourself???
apparently if you yawn after seeing someone yawn it means you feel close to them. and also apparently animals yawn when they are scared which sounds abit odd
freeeeeaky