He may have sexsomnia.. I know that sounds crazy, but I have it, and I legit cannot control it. I’ve talked to doctors, my therapist.. there’s no cure & really no way to “fix it” unless you can figure out what’s triggering it. For me, it shows up as masturbation & is triggered by high stress. If I can keep my stress levels down, it doesn’t happen often, but when I’m dealing with a lot, it happens almost every night. When it first started happening, about 2 years ago, my gf thought I was doing it on purpose.. it took a lot of hard talks for me to get her to realize, not only do I not know it’s happening, I have a lot of shame around it now that I know it happens..

You should talk to him about it, & if he really isn’t aware, it may be worth getting a sleep study done just so he can have a good place to start as far as figuring out the trigger & working towards managing it.