The midnight disease is a kind of emotional insomnia; at ever conscious moment its victim--even if he or she writes at dawn, or in the middle of the afternoon--feels like a person lying in a sweltering bedroom, with the window thrown open, looking up at a sky filled with stars and airplanes, listening to the narrative of a rattling blind, an ambulance, a fly trapped in a Coke bottle, while all around him the neighbours soundly sleep.