It's wintertime, and some snakes go off feed in the Fall and/or Winter. Especially once they reach adulthood. I'd see if you can find a place where you can cool down the snake to 55-60 degrees for six to eight weeks and then set it back up how you have it now.

Males sometimes go off feed in the Spring, but they usually become restless as well.

Tim

Wild Boulder City (NV) Cal King:
Third Eye
Third Eye