How do I keep my job from destroying my body and my life outside work?

You can operate for hours without a single lapse, and that reliability is something people's lives depend on. But it is being bought at a price, and you already know it: your body is wearing, and the life outside the operating room is thinning out. A strength that consumes the person who has it is not sustainable, no matter how remarkable it is. The hard truth is that endurance is not free, and the bill comes due whether or not you look at it. You can push a body and a life past their limits for a long time, and then not. Protecting yourself is not a betrayal of the work. It is what allows the work to continue. A surgeon who breaks helps no one, including the patients who need you for years, not months. Choose one boundary and hold it as seriously as you hold a case. Guard the sleep, keep the one evening, tend the body with the same discipline you give your craft. You are not a machine to be run until it fails. The same care you pour into others is owed to you. Spend some of it on the person doing the operating, so there is still a life when the operating is done.