Morningness-Eveningness questionnaire in bipolar disorder

The MEQ demonstrated high internal consistency with a Cronbach's alpha of .85.

• Lower MEQ scores, indicating eveningness, are correlated with higher levels of insomnia (r = -.34, p = .013).
• A higher proportion of patients with bipolar disorder (24.5%) showed eveningness compared to the general population.
• Patients on lithium had a significantly higher mean MEQ score (56.0) compared to those not on lithium (46.9, p = .007).
• Patients taking antidepressants had a lower mean MEQ score (46.0) compared to those not on antidepressants (52.6, p = .023).
• The MEQ score is reliable, but further studies are needed to explore the relationship between medication and chronotype.

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