Fatigue causes a reduction in alertness and reduced mental and physical performance. Research has demonstrated that we need at least 7 hours of sleep each night, but more than 30 percent of workers and 44 percent of shift workers are averaging less than 6 hours per night. This sleep debt accumulates over time, leading to memory problems, difficultly concentrating, poor or risky decision making, slower reaction times, and reduced work effectiveness and motivation. Chronic sleep deprivation is also associated with an increased prevalence of diabetes, heart disease, obesity and cancer. To protect our employees and ensure a work environment free from known hazards, we must effectively address fatigue in the workplace.