Their chromatophores will relax when they sleep, and adjust to the light when they wake up. We would let our chams free roam in my wife’s huge window garden during the day and you could see the split in their colors where one side would be dark from the sun and the other side was still light.

Their primary “camouflage” in their leaf like movements.

Veileds don’t need that high humidity, btw. They are from Yemen, after all.