The National Chronic Disease Study shows that 11% of the country’s population has trouble falling asleep. Two percent have difficulty staying awake during the day at least three days a week due to poor sleep; another 10 percent wake up early in the morning at least three days a week and can’t go back to sleep. Considering China’s huge population, this is a huge number. Previous studies have confirmed that poor sleep quality is strongly associated with all-cause mortality, cardiovascular disease, diabetes, cancer and mental disorders. The study enrolled adults aged 30-79 years old in 10 regions of China and found that the average sleep duration (including naps) of the national population was 7.4 h. In addition, this study found that there were also associations between napping habits and insomnia symptoms and sleep duration. Among them, those who did not have the habit of napping had a higher risk of difficulty in falling asleep and waking up early, suggesting that the promotion of napping in the general population may be helpful in preventing insomnia. Napping is often recognized as a healthy way of life to eliminate daytime sleepiness and reduce fatigue, however, recent studies suggest that napping is associated with an increased risk of all-cause mortality and diabetes. The study included 452,829 residents aged 30 to 79 years from the China Chronic Disease Prospective Study (CKB) program, and patients with coronary heart disease, stroke, COPD or malignant tumors were excluded.