For most of my childhood, my mother said good night at eight in the morning. She was a nurse on the night shift at Halbridge Infirmary—first on the surgical wards, later in intensive care—and she came home at about half past seven, as the rest of the city was setting out, and went to bed as the rest of us went to school. Our apartment ran on her sleep. We whispered at breakfast and took our shoes off on the stairs. On the front door, under the knocker, hung a card she had made herself: Night worker sleeping. Please knock after four. Most people respected it. The ones who didn’t were almost always delivering something.

I have been thinking about that card because it was, in effect, the only piece of public policy my mother ever had. She worked nights for 28 years, and in all that time the city she helped keep alive did almost nothing to acknowledge that she was awake. Its buses thinned to one an hour after midnight. Its shops closed. A jackhammer at 10 a.m. was perfectly legal, and spent most of one summer beneath her bedroom window. Her doctor kept office hours. So did her bank, and so did my school, which telephoned her, frequently and cheerfully, at two in the afternoon.

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