Tehran University of Medical Sciences Journal of Sleep Sciences 2476-2938 5 3 2021 03 02 101 110 Somayeh Hassani Virology Research Center, National Research Institute of Tuberculosis and Lung Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Iranian Research Centre on Ageing, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Parisa Adimi Naghan Clinical Tuberculosis and Epidemiologic Research Center, National Research Institute of Tuberculosis and Lung Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran Makan Sadr Virology Research Center, National Research Institute of Tuberculosis and Lung Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Iranian Research Centre on Ageing, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Majid Malekmohammad Tracheal Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran Javad Setareh Psychiatry and Behavioral Sciences Research Center, Addiction Institute, Mazandaran University of Medical Sciences, Sari, Iran; Department of Psychiatry, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran Seyed Mohammad Seyedmehdi Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2020 06 24 2020 11 25 Background and Objective: The present study aimed to determine the prevalence of insomnia and its related factors among elderly population of Tehran, Iran. Materials and Methods: This study was a cross-sectional descriptive study. Data were collected by a three-part questionnaire. The first part included demographic information; the second part contained data on weight, height, neck circumference, menstruation status, diabetes, hypertension (HTN), and heart disease. The third part contained questions about Insomnia Screening Questionnaire (ISQ). Cluster sampling was used and 651 samples were selected for the pre-sent study. Results: The prevalence of insomnia was significantly higher in female, single, and illiterate subjects and also in subjects with chronic diseases, psychological disorders, circadian rhythm disorder, restless legs syndrome (RLS), parasomnia, and sleep apnea. Conclusion: According to this study, insomnia is common among elderly population of Tehran, and there is a relation-ship between this disorder and chronic diseases, psychological disorders, and sleep disorders. https://jss.tums.ac.ir/index.php/jss/article/view/170