I'm going to assume you haven't had him long because of how small he is......it will take a little while for him to get the routine down. Soon he will learn the lighting schedule and get to a spot sometime before the lights go out. They can get into really weird positions sometimes to sleep and it's nothing to worry about. Soon he will find his favorite spot. My panther has one spot he loves and occasionally will sleep in a different spot but its rare. My veiled has his favorite spot in his plant but when he first came to me he slept hanging from the top a couple of times and he was over 9 months old.