First off, you HAVE to have a thermometer in there to make sure you don't cook or freeze him. Secondly, using an overhead heat lamp is likely creating a desert-like atmosphere in there. That radiant heat will eat up any humidity in the air or in the substrate. If you don't have a thermometer, then I can surmise that you don't have a humidity gauge. It could be simple seasonal behavior, or it could be that your snake is stressed out by it's conditions, especially since winter air is already too dry.

he needs a warm end and a cool end. A hide in each end. clean water, and some relative humidity. Heat tape or a UTH are preferable alternatives to a spotlight. Even if conditions are great, he still may remain a slow feeder in winter, but he'll be a happier fella for it
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0.1 C/B Lavender brooks
0.0.1 W/C Scarlet King
0.0.1 W/C Eastern Milk
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