From The New Yorker:
Of the many ways that things can go wrong in bed, sleep troubles are probably the most prevalent. According to a 2011 poll, more than half of Americans between the ages of thirteen and sixty-four experience a sleep problem almost every night, and nearly two-thirds complain that they are not getting enough rest during the week. The National Academy of Sciences estimates that fifty to seventy million Americans suffer from a “chronic disorder of sleep and wakefulness.” The results are dangerous as well as annoying. A recent study by the Centers for Disease Control and Prevention revealed that almost five per cent of adults acknowledge nodding off at the wheel at least once during the previous month. The U.S. Department of Transportation has determined that what might be called D.W.D.—driving while drowsy—causes forty thousand injuries a year in the United States and more than fifteen hundred deaths.
Our collective weariness is the subject of several new books, some by professionals who study sleep, others by amateurs who are short of it. David K. Randall’s “Dreamland: Adventures in the Strange Science of Sleep” belongs to the latter category. It’s a good book to pick up during a bout of insomnia. Randall begins with an account of his own sleep problems, which include laughing, humming, grunting, bouncing, kicking, and, on at least one occasion, sleep-walking into a wall. He considers a range of possible explanations for the national exhaustion—too much light, too much warmth, too much avoirdupois—and finds them all compelling. The electric light bulb has made darkness optional, eliminating the enforced idleness that used to begin at sunset. Modern mattresses and bedclothes trap the heat that the body gives off as its core temperature drops each night. Obesity increases the chances of developing sleep apnea, a condition that combines choking and waking in an exhausting, sometimes life-threatening cycle. For all these reasons and more, Randall anticipates a bright future for the emerging field of “fatigue management.” One sleep expert he interviews predicts that “fatigue management officers” will soon be as common at major corporations as accountants. Like time, sleep, it turns out, is money.