How long have you had him? If he's a fairly recent addition, I'd be inclined to say he's just getting used to his enclosure. They tend to be really active for the first couple of weeks before getting used to their environment and settling down.

If it's really bothering you, there's no harm in picking him up and sticking his head into his hide so he can crawl in. I'm sure he's perfectly fine, though. No worries :-)