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The natural history of insomnia symptomatology is poorly understood. Cross-sectional associations have been demonstrated among socioeconomic disadvantage, female sex, and poor sleep but it is unclear how these social factors predict patterns of insomnia symptoms over time. The aim of this article is to describe longitudinal patterns of insomnia symptoms as people age and investigate how they vary by sex and occupational class.

sleep

The Longitudinal Course of Insomnia Symptoms: Inequalities by Sex and Occupational Class Among Two Different Age Cohorts Followed for 20 Years in the West of Scotland