What To Do To Stop Sexsomnia?

My boyfriend and I have been together for seven months. Even before we dated I had heard he had mildly humorous sleep disturbances. He would moan, sit up in his sleep, grind his teeth. Usually I would just wake him up and he'd stop.

Earlier this month he made an awkward sexual advance on me. This consisted of him kissing the back of my neck (we were spooning) and putting a hand in my shirt to fondle my breasts.

I thought he was awake so I just told him to stop because I was tired. He did, and in the morning I playfully asked him what had him so steamed up last night. He got really frightened and had no recollection of the event at all. Then he admitted to me that sometimes he would wake up and find himself covered in semen from when he had masturbated himself sometime during
the night.

I told him I didn't mind it. He stopped when I woke him up and the behavior was always mild. Last night though, he yanked down my pants and began to violently force his fingers into my vagina. Again, he stopped when I woke him up, but I'm worried that the behavior is getting progressively worse.

What if he ends up like those other horror stories and he's suddenly strangling me in his sleep? Or what if I can't wake him up next time? I know he should go see a specialist, but the problem is that he has no insurance and is still paying off debts from the last time he had to go to the hospital years ago for Lyme's Disease.

So I was wondering if there was any sort of home remedy that we could try to get him to stop engaging in SBS?

Also, the incidents of sleepsex seem to have started shortly after I pierced my ear. I haven't been able to sleep on my left side at all, which is the primary side I sleep on, because it's just too painful and irritating for the piercing. I think my sleep has been unusually disturbed because I can't move around freely (I frequently change my sleeping positions.) Is it possible that my own sleep disruptions have somehow triggered these specific SBS disruptions of his?