Good luck with that. Our cat has learned to refuse to take "no" for an answer. She will walk across our heads early in the morning until we get up. If we shove her off the bed, she will then proceed to chew-up and shred any important paper she can find.
Our cat is 20, so he just looks at us the way any adult would look when they feel patronised. :D The only good thing about his slowly failing kidneys and high blood pressure is that he doesn't finish his meals as he used to, so there's always backup food for 3 AM.