Wet dreams? Wtf!

I had never known that women could have wet dreams. A few nights ago I slept on an air mattress at my parents house and in the middle of the night I woke up mid orgasm?? It was great and I immediately fell back asleep without even realizing what happened. I mistook it for a dream until it happened just two nights later at my apartment. I've never had this happen to me before and I'm wondering what causes it? Since it happened twice inside a week.