Is it normal for me to have sex with my boyfriend while he's asleep?

So here's the back story: my boyfriend sometimes talks in his sleep. Most of the time, he moans in his sleep and he gets hard. I used to get upset because he would moan another girl's name (usually one of his friends' name) and it made me suspect him of cheating, but he wouldn't cheat on me because he's too busy with work and his friends would never hook up with him. It's just sexual dream. I admit, I sometimes have dreams of having sex with my guy friends too. But anyways, I get irritated when he moans because I can't get any sleep, so I talk to him in his sleep and tell him that I'd have sex with him if he'll go to sleep afterwards.
I have sex with him all while he's dreaming and thinking it's another girl riding him. I got so turned on by the fact that he thought I was another girl named Chelsea. (a few years back, he almost hooked-up with her but she was too drunk and fell asleep before they could have sex) He would keep saying in his sleep, "I should have f---ed you that night" "your pussy feels so good." and I would respond by saying "you have a girlfriend already though. I'm gonna tell her you're cheating on her." and he would respond by saying "no! don't!"
and anyways, long story short, I get turned on when my boyfriend thinks I'm another girl. I get even more turned on when I pretend to be that girl. Is any of this normal at all?