Hmm... Ollie sounds very similar to how my kitty was for awhile. I agree with the other writers who suggested a vet eval, a play session and some food. If there is nothing medically wrong, could it be that he's hungry or thirsty? Could you feed him a little at bedtime, especially after playing? Then, maybe an early morning portion so he will let you sleep until the usual hour. Let us know how he does, please!