No, I've never hallucinated. But I can get so immersed in my daydreams that I'm unaware of my surroundings, and may even start talking/giggling out loud. If I don't catch myself and snap out of it, I can end up daydreaming for hours at a time, pacing around until I get tired or sitting motionless staring into space. Thankfully this doesn't happen much anymore. (Sorry if this was TMI)