You have to force them to rest
I have to find pockets in my partner’s schedule for him to sleep. He doesn’t even think about it. He’ll say yes to a 11pm show invitation, and I’ll have to remind him that the next day, he’s getting up at 8am to help his friend move and going straight from that to a birthday party and getting up the next morning early to pick up his mom from the airport. If I don’t insist he finds some extra sleep somewhere, he never would.