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These conditions are increasingly recognised not only as comorbidities but also as factors potentially influencing the severity and course of obsessive\u2010compulsive symptoms. This systematic review synthesises findings from 28 studies investigating the association between obsessive\u2010compulsive disorder, insomnia and circadian alterations across different age groups. Insomnia was found to be highly prevalent among individuals with obsessive\u2010compulsive disorder and associated with greater symptom severity, especially regarding intrusive thoughts and cognitive\u2010affective dysregulation. Circadian disruptions, such as delayed sleep phase, evening chronotype, and atypical hormonal rhythms, were frequently observed and related to emotional instability and clinical variability. These results underscore the importance of systematically assessing and addressing sleep\u2010related disturbances in patients with obsessive\u2010compulsive disorder. 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