I think it is a habit. He said yesterday that he could change it if he wanted to . I am not prepared to make the ultimatum that he sleep like the rest of the family, or leave .I can't see kicking out my child with nowhere to go over the sleep schedule. So I just had a conversation with him and expressed what my specific issues are with it which he was willing to deal with: taking out the trash the night before, so I dont have it overflowing during the morning, getting up when I get back with groceries to help bring them in, and do extra chores when he does get up .I am ok with that for now . When he works , he will have to change schedule anyway. He is a good person overall, and had grown and changed over the past year. We are looking into turning the internet off at 11pm since we pay for it and have the right to do so. When they were teens , internet went off at 10 pm and they rarely stayed up late.