It’s 5 A.M. on the morning of my daughter’s seventh birthday, and for some reason I can’t sleep. On the other hand, I’m too tired to cross anything off the week’s long to-do list. So I go to the kitchen and decorate her breakfast chair with balloons and ribbons. Then I go back to the study and look at the collage of her pictures we made yesterday, all taken in the past year, as family tradition has it. In one of...