Yes, it's a little tongue-in-cheek, but it occurred to me while reading the question on stealing a parents tuition by skipping, and I think that there is a real benefit in the question.

Is it Gezel Sheinah, stealing sleep, to wake up a student asleep in class? In other words, what are the guidelines for when we are not concerned about waking someone up? What are some primary sources which discuss Gezel Sheinah?

http://machzikeihadas.blogspot.com/2009/12/gezel-sheinah-and-divrei-yechezkel.html http://machzikeihadas.blogspot.com/2008/12/kol-koreh-against-gezel-sheina.html