Blue Nights, for Joan Didion, are that special time of year during the summer solstice and longest days between April and May where the wold is lit up by an eerie beauty. But she reminds the reader where she comes from, subtropical California, the Golden State, does not get Blue Light. It’s not Dylan Thomas’s refrain about not going gently into the night, nor rage, rage against the dying of the light, but a meditation on what it means to have...