It’s not an exaggeration to say lack of sleep is killing us. The Centers for Disease Control and Prevention calls it a public health epidemic and estimates that as many as 70 million Americans have a sleep disorder. Sleep deprivation has been linked to clinical depression, obesity, Type 2 diabetes, and cancer. The National Highway Traffic Safety Administration estimates that drowsy driving causes 1,550 deaths and 40,000 injuries annually in the U.S. There are 84 sleep disorders, and some 100 million people—80% of them undiagnosed—suffer from one of them in particular: Obstructive sleep apnea, generally indicated by snoring, costs the U.S. economy as much as $165 billion a year, according to a Harvard Medical School study. That’s more than asthma, heart failure, stroke, hypertension, or drunk driving. And the study doesn’t account for tangential effects, like loss of intimacy and divorce. BCC Research predicts that the global market for sleep-aid products—everything from specialty mattresses and high-tech pillows to drugs and at-home tests—will hit $76.7 billion by 2019.