Sometimes I wake up from dreams/sleep and see something. I try to pick it up and it's not there. I realize right away that I was hallucinating. I just laugh at myself and wake up more..
It would never occur to me to mention this to a Doc, unless it was happening a lot and during the day, when I was fully awake.
It seems like MS makes us more attuned to everything our brain does. These things are probably perfectly normal but we latch onto it as if we're going nuts... I don't think we are going nuts, we just have MS.