I have had Alice for almost three months. I had her in a bin and she would come out every night to run (and poop in) her wheel. I moved her to a bigger, much nicer cage and added a black heat lamp. Now she never comes out of her sack unless I drag her, which I do at least once during the day and every evening for about a half hour. I have the heat lamp on a timer. When the lamp is shut off during the night for about an hour she runs in the wheel. She is eating well and is very friendly once I get her out but I am concerned because she is in the sack all the time. Am I worrying needlessly?