It shouldn't be from too much light. Leathers get really funky sometimes, they just shrivel up for a while, maybe shed a layer of skin, and then are fine. I've had mine open and close, day to day, for over a month before. I've had it for over 6 years. They just do it from time to time. If it stays like that for over a week, then I would think maybe somethings else might be causing it. And honestly, it's polyps are still out, so it's not too bad. Mine has looked like a little shriveled stump before, and was fine afterward. Just keep an eye on it.