Stewie's Ok! i took him in to the vet and he said my problem was i wasn't keeping the pen hot enough at night. I got a bigger night light but the pen is so long that it is still too cold in the middle and cold end of the pen. i switched him to carpet( the vets xray found sand in his stomach). would an undertank heater placed in the middle of his pen be too much? i have the same problem at night, still a little cold. by the way, stewie( my dragon) looks a lot better and is eating like he was before, all overnight.