Mickey loves his cage as well. He only uses it to sleep and when he was a pup, we stupidly used it as a place to put him when he did bad. We really just wanted it to be a way for him to know he was going to be ignored for awhile. Luckily he didn't associate it as a bad place and we stopped that method soon enough.

Sometimes when he wants to nap and there is activity around the house, he'll go in his cage because it's quiet and comfy in there.