Having sex while being asleep

So my boyfriend has had issues for 2 years now having sex with me. This is happening more and more often now. He will come to bed and have sex with me or have me perform oral sex on him and not remember it at all. I bring it up and he has no recollection of it at all or he tells me he thought it was a dream. This hurts because I feel like some sick person for partaking with a sleeping person. He can respond and he wakes me up to do it so I’m half asleep too. I get really excited because it will be 3 weeks to a few months before we have sex. He swears he’s still attracted to me... I just want to know if anyone else has experienced this and what the outcome was. If you have not experienced anything like this please keep your comments to yourself. He’s willing to seek mental help now. Previously he was in denial. Thanks ladies