My son sleeps in almost every class. He finishes his work and then puts his head down and falls asleep, he says to keep from getting in trouble. Sadly, when he used to work on personal projects like sketching new maps for Minecraft, he got in trouble for not being in task. But when he sleeps, they leave him alone.
It is part of why I fought for seven years to get him appropriate placement.
I hope you can find a better fit. That is mind numbingly depressing to spend that much time every day waiting.
