Before I tell you about him here are the cage specs and his recent behavior:
day: 70-75, night 65-70 60 watt basking spot 8 inches from branch. 48"x24"x24" brand-new 18" exo-terra reptiglo 8.0 UVB light. Cage kept fairly clean, favourite branches rarely cleaned due to the inability to get him off of them without being bitten. Drinks not very often, about 2 times a week max. I feed him 6-8 med crix (1 or 2 superworms instead of 2-4 crix sometimes) every 2 days with cal/d3 supplementation on every 2 insects with Herptivite cal/d3.
Crickets gutloaded on oranges/baby spinach/other assorted salad green I steal from my fridge.
Corona (10 month old male veiled) has been found by me on the bottom of his enclosure, in a little nook between a pot plant and the cage frame. He was slightly dark coloured, nothing different than his normal darkish-lightish back and forth colouration over the daytime. I did notice his eyes looked kind of glazed over, but the eyes were not sunken. He was not moving as much as usual when he goes down to the bottom to look for food. He often used to come to the bottom and scratch at the cage when I was in the room, demanding more tasty insects. I would go up to him and he would sometimes get mad, be scared away, or if i put my finger up to his face, would try to eat my finger (not a violent bite, a leaf-eating kind of bite).
After I saw him on the bottom, I came back to check on him about 20 mins later ,and he was still on the lower part of the cage, but on a vine close to the ficus plant pot. He was medium-dark brown. I came back another 15-20 mins later and he was up close to his basking light, in a basking position, with the same darkish colouration. He is in a low-stress environment in my bedroom, which I go in and out of about 10-20 times daily, for very short periods of time, to say, get some change or to replace some clothes.
About a week ago, he was clawing at the screen DAILY. He clawed at the lights only, looking at them as a way out. He is right next to, but cannot see, one female chameleon whi is next to another female chameleon.
I came back today and saw him doing the same slow-moving, nooked in the corner, glazed eyes kind of thing. I moved my head up and down to see if his eyes would follow and thye did, but slowly. I cannot see any obvious signs of dehydration.
Anyone have any ideas whats happening, or am I over-reacting?!

