What are his temps and humidity at?
How is the temperature being controlled?
Is he doing this during the day, at night or at random?
My female would sit on top of her hide in the evening just because or would hang out on the cool side. When she was spending more time there I double checked my thermostat probe and it was not sitting properly so the temps were rising. If your temps are correct I wouldn't be too worried as he knows where the hides are at.