We live in a golden age of sleeplessness. The buzz of the all-night streetlamps, the natter of 24-hour news anchors, the scrolling Niagaras of social media feeds have built a world that is hostile to sleep. Night is no longer clearly delineated from day. The bedroom is no longer a refuge from the office. The physical and psychic walls that once held back the tides of work and social interaction have failed. As the essayist Jonathan Crary put it, sleeplessness is the inevitable symptom of an era in which we are encouraged to be both unceasing consumers and unceasing creators.