Organism in my sleep?????

Okay so boom this has happened to me twice so I’m sleeping right and it’s a deep sleep right and then like I’ll feel myself like beginning to like rock my hips as if I’m having sex and then I’ll have a orgasm while I’m half sleep but at this point I’m like half sleep half awake but I always fall right back asleep....... am I the only one I mean it feels good but like the shits weird🤦🏾‍♀️