What is the most comfortable posture to sleep in class and the least easy to be found?

The idea of several floors is shameful. Asking for leave with a cold is not a long-term solution. Obviously, you want to sleep for a long time! I quite agree with the second idea on the 4th floor, but since you asked about the most different findings, it means that you don't want to be the "student" who knew that he was reading with his head down, and when he put the book up, he knew that he was up to no good, and now the teacher is not so gullible. . The most pertinent thing is to sleep against the wall, but is it possible for the table to be so close to the wall? . . I have to draw a blackboard in the back. . But isn't there a back table? There is a lot of nonsense. In short, it's best to lean on the back table and nod slightly. There's really a lot of nonsense ...