I am trying to introduce my tortoise to his new home with a heat pad. He is used to sleeping in a burrow we made for him. When he wakes up in the mourning I put him in the new house and he loves it. He will stay in there for up to 4 hours. In the evening he still wants to sleep in the burrow. I will catch him going into the burrow and place him in the new house, but he comes out and goes back to the burrow. Any ideas on how to get him to spend the night in there? I live in Southern California, the big boy's name is Sheldon and he weighs in at 11 lbs. We have had him for 9 months