Newb here. I'm taking care of a ball python for a kids' summer camp that closes down for the rest of the year. I brought it home almost two months ago, and in the beginning it was very active. Every evening I would see it climbing all over its tank, and when I took it out it would explore all over the place. But suddenly about a week and a half ago it became totally inactive (though there has been no change in its environment). I barely see it moving at all, and when I take it out of the tank it just sits there. All day and night it lies in the same spot next to its hide. It is still eating (so far), but I'm very concerned. I tried raising the temperature in the tank (because the heat lamp it came with wasn't bringing the hot side quite up to 90), but it hasn't had any effect.

Also, I don't know if this is related, but when I brought it home it was just finishing shedding, but it hasn't shed again since then. Is that normal? I don't know how old it is, but it's about a foot and a half long.

I just noticed that the ball python caresheet on this site says not to use cedar as a substrate. This animal came with cedar in the tank and I was given a big bag of cedar chips with it, so that's what I've been using. Could that be making it sick? It's been okay with it up until now, though.