![]() ![]() However, both insomnia symptoms and insomnia disorder may run a chronic course. Former category includes subjects who fail to meet the syndromal diagnosis of insomnia owing to quantitative or qualitative aspects of definition of insomnia disorder. Insomnia may be divided into two major categories-insomnia symptoms and insomnia disorder. ![]() Natural history of insomnia has been examined in various population based longitudinal studies of varying duration and having different study population during non-pandemic time. Thus, there was a wide variation in prevalence of insomnia during COVID-19, perhaps related to a multitude of factors viz., method of diagnosis, demographic and occupational variable related to selected population, phase of COVID-19 pandemic to name a few. A meta-analysis suggested that nearly 40% healthcare workers experienced insomnia during COVID-19 pandemic. Pooled prevalence reported that insomnia affected 15% population during COVID-19 pandemic with greater occurrence in healthcare workers. It has been reported to influence approximately one fifth in France to third population in Greece. Insomnia appeared to increase during COVID-19 infection across globe. Third, diagnosis of insomnia could be made using questionnaires, clinical interview as well as using objective measures, viz. Second, till definition of chronic insomnia was clearly mentioned duration criterion in the international classification of sleep disorders, various definitions were used ranging from 1 to 6 months. For example, insomnia symptoms are more common than insomnia disorder. Besides demographic factors, prevalence of insomnia is also dependent upon the definition and method used for the assessment of insomnia. ![]() Highest prevalence has been reported from Brazil and lowest from Europe and Asia. Epidemiological studies suggest that 10–15% adults meet the present criteria for the diagnosis of insomnia. Insomnia is prevalent among all age groups however, prevalence of insomnia varies across ages and geographical areas. ![]()
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