Replying to Teachers that have an inferiority complex

Today I was sleeping in the library, when I didn't have a period scheduled. Anyway this teacher came in and slapped me, and told me I couldn't sleep in there. I looked in the handbook (first day of school today so they gave us one, that's why I was carrying it around) and nowhere does it say sleeping is prohibited in the library. I have been snoozing in the library since I was a freshman. And literally no one bothered me about it except for this young guy.