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You don't DREAM it. Your mind is fooling you into "remember" that you dreamt it, but you didn't. Happens with me all the time. Big ones, and small ones.
A yawn stimulates the brain to do another activity. Its catchable, because when like the pack leader say, wants to go to another area, he will yawn, thereby making the others in the pack yawn, also stimulating them to do some other thing.