Does it get up to eat?
I know that my bgk "sleeps" in the strangest positions, normal, on his back, vertical head up and head down. I've never seen him lying on his side, but his favorite hole seems too narrow (although he manages to turn around inside it).
How is his chosen hiding place? I wouldn't worry unless he doesn't come out for food or sleeps in a curled position (even then, I don't really know). The eating is the main worry.
Brandon