Rape Or Not?

My Ex Husband Has Sexsomnia. I Just Found Out After 2 Years Of Being In The Abusive Relationship With Him. But When We We're Together He Sleep With Me Sexually Without Me Wanna It. I Would Try To Get When Off Of Me But Would Fail And End Up Just Taking It. Some Nights I Would Be Awaken By Him On Top Of Me. I Had Talk To Him About It And He Said While My His Wife I'm Supposed To Let Him Have It When He Wants....My Question Is, Is It Rape?