there’s a limited number of sound decisions you can make in any one day, and as you make more and more, you erode your ability to regulate your own behavior. You start making mistakes—eventually, serious ones. As the Maxwell Curve shows, those bad decisions impact productivity. So go home at five. Turn off the cell phone over the weekend. Watch a movie. Perhaps, most important, have a sandwich. By not working so much, you’ll get more and better work done.
