Abstract
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 present 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 relationship between this disorder and chronic diseases, psychological disorders, and sleep disorders.
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