What is your husbandry like? Temps on hot/cool side, ambient air temp etc. It is pretty much a given to give a much detail with regards to your husbandry and tank setup before any answers start coming your way. Any changes to his living environment (new substrate etc?)...

Typically it is recommended to have two identical hides on both your hot side and cool side so that your snake can feel secure and thermoregulate without having to choose between the hide he likes best.

I'm sure others will have lots of insight for you once you post up the specifics...