The fact that I am sitting here LOL is probably not helping you. It is just that it reminded me of Sterling. He would lick my hair and face in the middle of the night for what seemed like forever!!!!!! I would actually have to get up and go into another room and hold him and pet him to settle him down so I could go back to sleep (and he was older than your Romeo). I guess the time we spend sleeping is simply too long for them to be without attention. And they do what seems most natural to them. Your choices are simple: Allow the behavior, they'll grow out of it (and I add, that no matter how annoying it is, you WILL miss it when they stop). OR bannishment from the sleeping quarters.
Have fun.