Reward and punishment. You need to really look at his ride. If these behaviors bother you a lot then you need to refuse the belt and the brush until YOU determine the when and the where of them...He is setting the pattern...and will continue if you let him. Somehow get it on your timetable....or make him TALK about what he actually did that was so bad...(TALKING the NEW punishment for alien masochism.)
The good news is that he DOES RECOGNIZE WHEN HE IS AN ALIEN. The sleeping, however, is a real indication of how he needs to check out. It is almost as if he reaches some capacity for how close he will allow himself to get.
Anyway...I did like that you are gonna get your little vacation times! Great idea. I want to checkout that book.