The day after Halloween, everything around us—ads, store displays, music, and the like—put us on notice: Christmas is coming. With the announcement of Christmas's imminent arrival comes work, work, and more work. We mutter under our breath for lazily storing the Christmas lights in a tangle; we wring our hands over finding good gifts and planning the perfect Christmas meal; every major checklist item includes dozens of decisions and subtasks, each with their own obstacles and pressures to complete. The biggest checklist item: completing all your work with Christmas cheer.In this...