The other morning, I was digging around for something in the back of my closet when I found a framed photograph I’d stashed there in one of my fits of manic tidying.

My wife, Lael, and I had repeatedly been cautioned by our experienced friends to expect severe, relationship-altering sleep loss after the birth of our daughter. The truth was, though, that we looked forward to the challenge.

Last night I did what I ordinarily do around eleven o’clock. I shut down my laptop computer and put it away, then closed the book I was reading and set it on the lamp stand next to the sofa. I brought my water glass and my wine glass into the kitchen and put them in the dishwasher. While my husband went outside to smoke his last cigarette for the evening, I climbed the stairs and readied myself for bed.