We all know that diet and physical activity are essential to good health, but many are unaware that getting adequate sleep is equally important, if not more so. Sleep affects everything from energy and appetite to performance, mood, attention, memory, and decision making. It is the time when the brain forms and maintains the pathways that let us learn and create new memories. Recent research suggests that the body uses sleep time to remove toxins and metabolic trash from the brain (possibly including the plaques that contribute to Alzheimers disease). Habitual short sleep duration is associated with greater risk of obesity, high blood pressure, diabetes, depression, and cardiovascular disease. Unfortunately, about one third of U.S. adults get less than the recommended seven hours of sleep a night.