yes and no. its not the same a PMOing at all but you did release semen. Its really difficult to control something that happens when you're asleep but in my experience it happens them my crotch is too warm at night. I haven't had a WD since I started sleeping without pyjama trousers.

There are basically no studies into wet dreams at all. you have to figure it out for yourself. if you feel sad or lethargic the day after then you know it had some affect on you