I recently heard about a study that showed napping can help reduce your risk of death from heart disease.  What are the benefits of napping and what is the connection between sleep and heart health?
D006331:Heart Diseases / Q000401:mortality / Q000517:prevention & control*; D006801:Humans; D012146:Rest / Q000502:physiology; D012890:Sleep / Q000502:physiology*; D013997:Time Factors