Ok, this was very strange, and I'm still trying to figure it out.
I was 17 at the time and I just had a long day of school. I have been masturbating on a pretty normal basis since I was about 15 (I know, I started late). I haven't done anything for quite awhile, I'd say about two weeks, so I was feeling pretty full. That day I knew that if I didn't do anything soon, then I would end up having a wet dream, and those aren't fun, and you don't get any pleasure out of it, besides a dream. But that night I was too tired from school work, and homework, etc, so I didn't think I was going to do anything.
I fell asleep at around 10:30 that night. Around 12:30 I noticed that I was partially awake (you know that place between being awake and asleep?), and I noticed I had a raging hard on, even through my half-sleep. I was barely aware of what I was doing, but I started stroking myself, totally randomly. I noticed I started stroking faster and harder, but I was still asleep. Then it hit me. I came so much. It was a never ending orgasm, and felt so incredibly good!
After I was done, I fell back asleep, even though I was pretty messy. But it didn't take me long to fall back asleep. I woke up the next morning, barely remembering what had happened that night. I was still sticky with dry cum and I was totally confused. But I remember how awesome it felt, and obviously some other details. I know there is more but I just don't remember.