I have a ball python, Severus, who has always stayed in his shelter most of the day (pretty normal from what I have read). However, about two months ago, he went on a "shelter strike" and would sit anywhere except for in his shelter. He was still getting the heat from the under tank heater because it heated more than his shelter. His new favorite place was to be wedged in the corner of the tank. It didn't bother me because he was still eating and obviously not distressed (he's a difficult eater so if he is eating weekly, it's a sign he is VERY happy)

Well, now this is his new thing:



I never catch him actually going in, but he doesn't use the door at all anymore. I had this problem with him in the past wanting to wedge under his water rock, but I was able to arrange the substrate where he could not do that anymore. Should I be worried? i don't want him to get crushed, but he seems to think he is above using doors.

He fits in the shelter completely. It's a snug, but not tight fit. He just doesn't coil as much anymore. When he is sleeping, sometimes he coils tight, and other times, he is all sprawled out like in this picture.