I'd suggest asking your P-doc/therapist/GP, etc. You could have a kind of sleep disorder--there's many of them. I've known people to hit the person beside them in their sleep--hard--and have no memory of doing it; that's some sort of sleep issue/disturbance. Also some people have night terrors---I think they have vocal nightmares in their sleep?

I have Sleep Apnea. I don't do anything that interesting, But I have woken my boyfriend up countless times snoring (he's a sound sleeper), completely unaware I've done it. I've also woken up not breathing, on top of sleeping sleeping and sleeping and never feeling rested. My P-doc mentioned more than once I needed to get it checked out. I asked if I should be on a sleep med, he quickly said, "No." I think it's partially because a lot of ppl on sleep meds get addicted to them--and supposedly with some of them they prevent ppl from getting to the REM stage, defeating the purpose of the sleep med completely. I also think he simply saw--after years of appts--that my sleep issue wasn't getting better.

Of course I'm not saying you have a sleep disorder. But it'd be interesting to see if you can find the reason behind it.