"I know you don't," Adam said. "I didn't want to disturb your beauty sleep, though. Even though you clearly get plenty of it." He smiled at William. "No need to do anything on account of me, I can take care of myself, as you can see. I promise I won't hurt your books, but you should definitely go back and get some more sleep."
Adam understood the point William was trying to make. He was also ignoring it. It wasn't like he was a student and he was going to destroy the library or anything. William could go back and sleep and Adam would stay and keep working. It would be kind of like shifts, only Adam was so not dealing with any kid who dared come through the doors on a Saturday. Not that he expected a large number of kids to come through the doors or anything, but still.