I've had a few of those in the past... I am sure that whever I've lost by now, I have forgotten, and am none the worse off for it
IMHO dreams are nothing more or less than the brain going on "autopilot" through a train of thought. This train of thought is determined by whatever is bugging you at the moment.
You must have been concerned with, oh.. say, your teeth for instance? Your brain took that idea, and ran with it.
The simplest explanation is usually the one closest to the truth (or at least I hope so!).