My H refuses to respect my feelings...

Im finally going to reach out about this and see what you ladies have to say! Ive been my husband for 15+ years, thru every up and down you can imagine. EVERY. We started young so he has been the majority of my sexual experience in life. We had a few splits so i've been with others, but always in my mind knew he was far better than anyone else. Well, here is the deal - for the past 5 years, its seems like he comes on to me only after I start to fall asleep. We both are very busy and life keeps up separate, but on the weekends and some week nights we do have time together, so time is not an excuse. For instance kids can be in bed and we can be on the couch watching movies for 3 hours.... nada, but as soon as we hit the bed and my eyes are closed and i start the light snore, i feel him fondling me. And i have ignored it im my sleep hoping he would stop. I have told him stop. Ive asked him stop. I woke up yelling. I think once i woke up swinging. He doesnt care about my reaction. Good now im awake and he can get some. Buy it almost seems as if he enjoys waking me from my sleep. Now i work 8-4 and im in school 5-1130 most nights and my studies and laundry and adult responsibilities keep my EXHAUSTED. I have argued with him til im blue in the face about this. He says i reject him. But why do u wait til I fall asleep?!?!?! I have tried to beat him to the punch and come on to him like in the kitchen or laundry room, u know, when im fully awake. He is not interested. Only when i am asleep. Is he sick? Is it me? I have wanted to end our marraige because of this. I feel violated and degraded as a woman. And the fact that he uses my anger as rejection toward him..... makes it worse. Ladies, i need your help :(