I've been making my girlfriend give me bjs while I'm sleeping

From what I've been told from my gf while I'm sleeping I'll start randomly mumbling in my sleep then I'll grab her by her hair (she does like this keep this in mind people I'm not assaulting her) and I tell her "get down a suck you slut" and she. I'm completely asleep when this happens and I normally don't wake up till she's about midway through. What do y'all think is going on?