sick_and_tired

my best friend who is now my boyfriend has always had sleep disorders, but now that we are together it has gotten worse... at night he will hit me because of a dream he had in which i did something to **** him off (i'm not talking accidentally here, i'm talking FULL ON HITTING!) his last girlfriend he full on punched in the face in his sleep because of a dream he was having, (he sat up in bed, turned to her, and punched her in the face) i'm worried that it's going to get to that point...he wakes me up every night with either hitting or elbowing me (this he does on accident, though i don't know how he manages to do so when i am on the complete opposite side of the bed from him), do they have some kind of study that they can do on him to see what is going on?? because there has been times that he will have an arguement with me in his sleep and not remember it the next day (he will full on get up and out of his bed, come out to the living room, and start yelling at me for being mad that he's sleeping while i am there, and the next day he doesn't remember any of it!) so if anyone can help me, please do so!!!!! i would greatly appreciate it!!!! and another thing, when i confront him about it, and tell him that if that does happen, that i won't sleep in the same bed with him, he brings up the fact that i am bi-polar...and totally brings me down...why can't he just understand that i don't want to wake up with a friggin black eye one morning?!?! and another thing, when i have my mood swings, i'm not hitting him...he's trying to relate my mood swings to this......why is he doing that??