He's just exploring and figuring everything out.
I always find one of mine sleeping in a weird position, and others sleep in the same spot every night.
It's normally pretty rare to see your chameleon drink. I think I've seen mine drink twice, ever... the best way to tell if he's hydrated is his poop. If he's got the little white part attached or near his feces, you're fine.
Ive seen him poop once, the day I got him. And the white part was orange. He is probably under hydrated. All I can do is spray the terrarium twice a day for a minute. And have the mister mist for 2 mins 5 times a day (it mist a portion of the terrarium, towards the bottom). Should I mist the chameleon itself? Or just the terrarium and he will find the water himself? He is small, so a water drop could drown him if I spray him.