Sleep plays many important roles in health maintenance and disease prevention. Adding a focus on sleep may improve your daytime function and quality of life. In addition to heart health, sleep is closely linked with mood, ability to handle stress, risk for depression, ability to be clear-headed during the day, memory, concentration and many other brain functions. It is tied to energy level, focus, and even productivity. Although our society often sees sleep as unproductive time, that is a misguided perspective. Sleep is important to maintaining health, productivity and quality of life. The American Heart Association recommends adults should strive for at least seven hours of sleep per night.