I am writing this essay at 9 p.m. That’s not unusual for me. I write and edit a lot of things at odd hours. I started working this way when my first kid was born seven and a half years ago, and now as I’m expecting my fourth, it’s become the rhythm of my life. Working a “split shift” -- some during the day, and some at night—lets me work long hours and still do family dinners and play with my kids. As I talk to other working parents, I’ve become increasingly convinced that this modern version of a second shift is far from crazy. Indeed, it’s often the key to that alleged impossibility: having it all.