Do adult ball pythons become less active?

So when I first got my adult pastel the first two weeks or so he was active at night but later got a bit lazier and stayed on the cool side. When i fed him last week on sunday he went to the warm hide and hasnt left since. I held him and checked his belly on thursday and he had a pinkish belly. He still has a pink belly and its hard to tell if my ball pythons eyes are blue or not because he has eyes that arent full black but more of a line in the middle of his eyes. Its day 6 and pink belly isnt gone and has bit grey eyes. Is he in shed? When will he fully shed?

pictures would help

It sounds like your snake might be in shed. Yes, they do become less active while they are in shed.