A male camper tried to masturbate me in my sleep, how to approach this situation?

I am a camp counselor and we stayed in a hotel this past week. I was in a room with two 14 year old campers. One of them was trying to masturbate me while I was trying to sleep. As soon as he tried to touch me, I turned the other way. He left me alone the rest of the night. How do I deal with this situation? It feels really weird.