Insomnia is a common problem, and symptoms may include difficulty falling asleep, lack of sleep or waking up too early, which can make it difficult to concentrate during the day and is often associated with anxiety or stress. A study of nearly 500,000 people in China found that people who had difficulty falling asleep, waking up too early or were unable to function during the day had an increased risk of heart disease or stroke over the past 10 years compared to people who did not have sleep problems. However, this does not mean that a stroke or heart attack is directly caused by lack of sleep; a variety of dietary health and lifestyle factors may be associated with sleep problems and risk of cardiovascular disease, and it is very difficult to completely eliminate all influencing factors in a study. The researchers who conducted the study were from Peking University, Chinese Academy of Medical Sciences, Jili Community Health Service, Qingdao Center for Disease Control and Prevention and China Center for Food Safety Risk Assessment, and the University of Oxford, UK. The study was funded by the National Key Research and Development Program of China, the Ministry of Science and Technology of China, and the National Natural Science Foundation of China, and was published in the peer-reviewed medical journal Neurology. Researchers recruited 512,715 Chinese adults aged 30 to 79 years from 10 regions of China and completed a survey of their health status. The survey from 2004 to 2008 included the following questions: Do people have difficulty falling asleep or waking up in the middle of the night Do people wake up too early to get back to sleep Do people have trouble concentrating during the day due to lack of sleep People who had this happen at least three days a week in the past month were classified as having this condition. Researchers recorded diagnoses of cardiovascular disease, which included coronary heart disease or heart attack, and stroke. They then looked at whether people with symptoms of insomnia were more likely to be diagnosed with cardiovascular disease during an average follow-up period of 9.6 years. 11.3% had difficulty falling asleep 10.4% woke up too early 2.2% were unable to concentrate during the day 130,032 cases of cardiovascular disease in 487,200 people over 9.6 years. The study found that people with any of three sleep problems had about a 10% increased risk of cardiovascular disease compared to people without any sleep problems: 9% increased risk for people who had difficulty falling asleep 7% increased risk for people who woke up too early 13% increased risk for people with poor concentration during the day The researchers also found that the more insomnia symptoms reported, the higher the risk of cardiovascular disease: People who reported having 10% increased risk for those who reported 2 symptoms of insomnia 18% increased risk for those who reported all 3 symptoms Early detection and treatment of individual insomnia symptoms may be able to reduce the subsequent risk of cardiovascular disease, especially in younger people and in adults who have not yet developed hypertension”. Conclusion: If you have only a few sleepless nights, there is no need to worry, the results only apply to people with persistent insomnia symptoms. There are some limitations and influences in this study that do not completely eliminate the influence of other factors. However, we do know that persistent insomnia can be harmful to your health, making you feel tired, irritable and even depressed. If you are experiencing persistent problems with sleep, it is recommended that you seek medical attention to further improve your symptoms.