Sudafed gives me really intense dreams. It comes from the pseudoephedrine which is an amphetamine (speed). It tends to make the mind race. I hate it because I never feel like I got a good sleep when I take it, but its the only thing that will let me breath at night. Now my dreams are usually in color and detailed (I dream climatically for some reason, with 2 shots, close ups, fly bys, etc) When I'm sick though I start hearing and feeling things. There also seems to be a lot more "background shit" in my dreams. (like buildings, clouds, moving cars, etc) It can be very good or very bad. The nightmares are the worst.