“Lack of sleep is directly related to cardiac diseases,” Sanjay Manchanda, head of Sir Gangaram Hospital’s Department of Sleep Medicine, said. “Quality of sleep is very important. A good night’s sleep prevents heart attacks, diabetes as well as road accidents.”The study, carried out by the hospital in collaboration with PhilipsHealthcare, also proves the correlation between lack of sleep and heart ailments. It said that 58 percent of patients of cardiovascular disorders had severe sleep apnea and an estimated 85 percent of them were not aware that sleep apnea and cardiovascular diseases were correlated.Removing some of the myths associated with sleep apnea, the study further said that there is no correlation between weight and extent of sleep apnea.