I had the perfect roommate, he had night shifts, he’d do 00:00 to 09:00. He would come home around 10:00 and sleep toll 18:00 and then we’d enjoy our evening together. I’d go to bed and he’d go to work. He’d been doing this for 6 years at that point and it suited him fine and he was healthy as a horse.

I think the thing that worked for him was treating even the weekends like weekday and he’d sleep through most of his Saturday/Sunday daylight.