Mine has yellow/white/beige "pajama colors", and he's a blue-barred Ambanja Panther. Chameleons change a color at night that they normally wouldn't turn into during the day. I wouldn't worry about it, it's normal if it happens at night.
Thanx guys! I just wanted to check. That makes sense about not needing to absorb the light at night Today Tanzy has the most blue i have seen!!!! So exciting