Sleep Walking?

Mike woke up this morning at 4am because he saw the lights on in the kid's room and the living room. We both got up right away. Both kids were in bed, but at sometime in the middle of the night Michael had gotten up and was a very busy boy playing in the kitchen, living room and bedroom. Now, I can't figure out if he was sleep walking and doing this or was actually awake and went back to bed.

He had gotten out his coloring book and crayons in the kitchen, they were laying on the floor. He had situated a pillow and blanket on the couch and played with his 'Mac' (from the movie Cars) and he had lined up some cars and the entrance of his bed room.