I don't think I snore on planes, but if I do, I would be absolutely fine if the FA, or whoever is seated near me, shook me gently, woke me up and said, "You're snoring." On the other hand, if someone deliberately kicked the back of my seat (at least hard enough to wake me up), I'd probably ask the FA to tell that person that, if they do it again, I'll ask the police to meet the plane.