So I adopted a 14ish-year-old BP about a year ago. He's been eating like a champ, shedding fine, and is in the same 40 gal terrarium set-up that his previous owners kept him in. Over the past month, he's skipped two meals (a medium sized rat, and then a small rat I was hoping he'd snack on) for the first time since I've gotten him. And over the past two nights he's been EXTREMELY restless, pacing the tank, pushing on the lid, exhibiting general signs of stress.

The problem is almost nothing in his tank has changed. Temps are holding steady at 90-92 degrees on his basking side, 75 on the cool side. Humidity was low a few weeks ago so I started misting the tank once a day to bring the humidity from 40% to 60%. Not sure why he's suddenly refusing meals and so stressed out. I checked him for mites, gave him fresh water every other day, and generally tried to keep the traffic near his tank to a minimum, but as soon as the sun goes down (around 5pm out here) he's out of his hide and trying to escape. Today I even caught him straining up towards his heat lamp. I'm nervous he's going to get burned.

Help??