Thanks for your encouragement! Bosse actually started to get up slightly earlier, around 11 - 11:30 pm, which is better than after midnight. I'm hoping for even more improvement as he gets more confident.
Also, I exchanged his old house which he refused to even go into (if I put food in there he would just streeeeetch to reach it and then back out) for the terracotta burrow, which he seems to like a lot more. Although I doubt he will ever sleep anywhere but in his own deep bedding burrows
