People who sleep for less than seven hours a day, including naps, are at a higher risk of cardiovascular disease. Sleeping fewer than five hours a day, including naps, more than doubles the risk of chest pain, heart attack, or stroke, according to a study conducted by researchers at West Virginia University’s (WVU) faculty of medicine.
Too Little Sleep May Raise Heart Disease Risk
Prof. Lakshman Madurasinghe 's Blog 