Uhm, wow, I've seen swirls of colors (very mild, kind of like "auras") in a dark room and short noises when close to falling asleep but that is the extent of these hallucinations. I also know that they are rather common, the sounds and the colors. I didn't know that they get stronger than that for other people.

I had a lot of anxiety the other day and heard a strange zapping noise in one of my ears for a second or two as I was near to being asleep. It made me think that I could have a seizure, and I was actually afraid to relax. Eh, silly me, I've never had a seizure. I'm not sure if hearing electric noises is even a warning to one.