I don't believe that "most modern countries" don't make exceptions for work that requires it or critical fields. In fact, those of us who've worked non-traditional shifts usually get some perk out of it. When I worked 12 hour shifts I'd work 3-5 days in a row, then get the same amount of days off. To this day 5 days on 5 days off is the best schedule I've ever had. I also had a friend working in mines up north in Canada. He'd work on-shift for weeks at a time and then get 3 weeks off with a flight paid anywhere he wants in the world. Is Canada not a modern country?