How about a humid hide?

Basically, this can be made with a plastic container. Cut an entrance hole, and keep moist moss or paper towels or whatever inside. The gecko will use this during shedding or whenever else they feel like it.

If the bulb is a bright light, swap it out for a red or black light bulb instead.

Also, I would switch to cage carpet instead of sand. Sand can get dirty fast and harbor bacteria...almost every leo I've seen/heard of with health problems like prolapses or mouth rot, were being kept on sand.

Hope that helps.