Walking on substrate bottom normal?

My Jackson's Cham Loki seems kind of odd. When I come home after 6 hours at school, I find him wandering the floor substrate of his terrarium and extremely dark. He lightens up after I come in and scrambles back up the branches. Why does he do this? Should I be worried? :confused:
 
Maybe it's to hot and he is trying to get as far away from the light as possible. Jackson's prefer it a little on the cooler side.
 
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