“Sometimes in dreams there are visions of the past. For that reason Alice Prentice had always welcomed sleep, but she suffered an insomniac's dread of the time just before sleeping, the act of falling asleep itself, the perilous twilight of semi-awareness when the mind must struggle for coherence, when a siren or a cry in the street is the very sound of terror and the ticking of the clock is a steady reminder of death.”