You said it doesn't sound like he's eating or drinking. Can you not tell if he is by the food and water level? You may want to start counting kibble. Also are other things in the cage disturbed? I know I can sleep through Dora's moving about but I know she's been up by the food missing and her toys moved around and the poopy wheel. As for the wheel, we were fortunate and both are babies took to it like a duck in the water. From previous posts I've read, people suggest placing your hedgie into his wheel when you return him into the cage and blocking him in with your hands for a moment.