Lack of sleep and/or untreated sleep disorders have serious consequences for productivity, safety, health, and quality of life. Despite this, sleep needs tend to be ignored by American culture in general and corporate culture in particular. This article describes the implications of insufficient or inefficient sleep for workplace functioning and the ways in which workplace characteristics affect sleep. Poor sleep costs businesses directly through lost productivity, compromised physical or emotional health, impaired cognition, accident rates and absences, and indirectly through such factors as poor morale, poor social relationships, and depression. A number of steps that businesses can take to improve employees' sleep and their health-and, ultimately, their productivity-are offered.Sleep-we all do it, although not always very well. It is necessary for life, yet we often knowingly or unknowingly deprive ourselves of adequate amounts of it; we obtain medical care for an illness or injury, but fail to seek treatment for a sleep disorder. This article describes the consequences of sleep loss and raises sleep issues that are related to the workplace. The impact of sleep loss is often unrecognized, but it still has a major impact on how well a business functions. It is, therefore, in the best interest of companies to pay attention to their workers' sleep. As Czeisler has noted, "A good sleep policy is smart business strategy. People think