<human>: Can you condense the text into a few key points?

Recently my fiancé got a new job as a manager working 3rd shift (10PM-7AM). Every single morning when he gets home from his shift he goes immediately asleep and doesn't wake up until about a half an hour before his next shift starts. 

At first I wasn't concerned because I understand that the schedule change from his last job (8AM-5PM) would take some getting used to, but it's been a few months and he still keeps this schedule every day that he works. He's lost almost 10 pounds because he's no longer eating regular meals, I pretty much never see him because he's always asleep or at work, and I'm left to take care of our animals and other responsibilities by myself. 

I'm really starting to worry about him because I know there's no way this is healthy and normal, but every time I try to bring it up he gets upset and tells me he's just really tired from work and needs to sleep this much. How do I talk to him about this, and convince him that this is not normal?
<bot>: My fiancé sleeps for 12 hours after every 9 hour night shift he has and literally does nothing else but sleep and work