A new study found that long naps have a range of negative effects on human health. Researchers at Brigham and Women's Hospital in Boston evaluated the sleep and health patterns of 3,275 adults from Spain.
Those who did have a longer siesta were found to have a higher body mass index, wider waist, higher blood pressure and an overall prevalence of metabolic syndromes. But those who rested for less than 30 minutes (defined as a light nap) did not have an increased risk of obesity and other metabolic concerns.