I'm too lazy to check my notes (because I wrote this down since it was so funny), but the gist is as such:
Our VERY eccentric Torts professor from 1L lecturing us on intentional torts:
"In order for there to be assault there has to be APPREHENSION on the part of the person you are assaulting, they have KNOW it's coming. So, for instance, if you wanted to kiss Sleeping Beauty, and she was asleep, and didn't know you were looming above her about to kiss her, that's not assault, she isn't fearful of your impending kiss. And, staying on the Sleeping Beauty example, if you want to, say, practice your swordplay right over her face all night long and she never wakes up and then in the morning you just walk out with her never even realizing your were there, and you never touched her, that's not assault either."