When it comes to our personal health and well-being many experts emphasize the importance of plenty of restful sleep. In fact, experts suggest that sleep affects everything else we do to one degree or another. Lack of restful sleep has been linked to weight gain, chronic fatigue, irritability, and a host of other conditions. Lack of restful sleep also inhibits the body's ability to repair itself after an injury or when suffering from other sicknesses and diseases.