S.K.
I'm inclined to go with Rachael H. He is testing you. This will go on, off and on, until they're 18 or maybe beyond! A usually wonderful child is suddenly possessed! My mom-in-law, who has her masters in early childhood pyscology, says it's a control issue, so let him pick the book you're going to read, what pajamas he's going to wear, his bedding next time it's time to buy new stuff, the toothbrush next time you need a new one of those, any little thing you can give him a choice about without life becoming a royal pain in the tailbone. Anything but what time he goes to bed and how long he stays there. YOU have to control the quality and quantity of his sleep.
Maybe get a camera set up in his room so if someone accuses you of something you can prove he did it himself?! That's what I would do if it were me, especially if he goes to daycare and especially if you're in the military. They look sharply for that sort of thing (in my experience as a base level AF photographer.)
Good luck! -S. Kav