Sexsomnia

So has anyone else had any experiences with sexsomnia before? I slept at a guy’s house and was very clear with the fact that I was okay with most things other than oral or penetrative sex. He was very receptive and understanding and we messed around for a while and fell asleep. I woke up and he was naked sitting on top of me. I was confused at first asking what he was trying to do (I was still waking up) he was very confused and despondent himself. He mostly mumbled and got off of me. After that he was more awake but still confused and said that he had woken up sitting on top of me. I’m pretty sure it’s a case of sexsomnia and I’m trying to understand what happened and how much happened at that. We talked about it for a minute then brushed it off. He seemed very embarrassed and I decided to talk to him about it later. Please if you have any experience or insight with this stuff let me know. I’m not sure if we had sex last night or not