If he's doing this while you're asleep, then you can't consent. That's rape. If I'm understanding you, you were awake when he first did this, but sometimes he just crawls on top of you while you're asleep, and you wake up at some point?

Regardless, you've told him this makes you feel disgusted and violated, and he should respect you enough to feel bad and to stop it. If he continues doing it, he's committing a crime. You need to call the police or consult a legal representative. What he's doing is NOT ok, and it is a sexual assault. Do you have a psych? TELL HIM/HER!!! IMMEDIATELY!!!