While I do not believe you have any thing to worry about, for this type of sexual activity is very common of both the male & female in the middle of the night when they stir and feel their lover next to them....... I would still talk to your boyfriend concerning how you feel about this and that you would rather that he not touch you sexually when you are not awake.

P.S.
I for one love to be awakened by my husband in the middle of the night with sweet gentle touches and soft kisses.