If your job is to build cars, there is little you can do when you’re not on the assembly line. You detach from work and leave your tools in the factory. But if your job is to create a marketing campaign—a thought-based and decision job—your tool is your head, which never leaves you. You might be thinking about your project during your commute, as you’re making dinner, while you put your kids to sleep, and when you wake up stressed at three in the morning. You might be on the clock for fewer hours than you would in 1950. But it feels like you’re working 24/7.
