BackgroundPeople with Major Depression Disorders (MDD) often complain about sleep problems and experience emotion dysregulation. Prior research suggests physical activity can improve both sleep quality and emotional control. However, there is limited research on emotion regulation and the impact of physical activity and sleep in this population.ObjectivesThe present study examined the relationships between sleep quality, emotion regulation, and physical activity levels among patients with MDD.MethodsThe sample consisted of 118 patients with MDD (mean age: 31.85 years) who completed questionnaires on sleep quality, physical activity, emotion regulation, and depression.ResultsResults showed that more sleep problems were associated with worse emotion dysregulation, and more physical activity was associated with fewer sleep problems and less emotion dysregulation. Furthermore, physical activity and sleep quality significantly predicted emotion dysregulation, with physical activity being the stronger predictor.ConclusionsResults from this study suggest that individuals with MDD who are able to engage in physical activity and get better sleep could experience emotional regulation benefits.