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Dim light melatonin onset clock time (A), phase angle (B), circadian preference (Composite Score of Morningness) (C), and depressive symptoms (D) for all participants. Vertical dashed line in A shows average habitual bedtime (diary). Solid lines represent mean and SD. Key: DLMO—dim light melatonin onset; HBT—habitual bedtime sleep; CSM—Composite Scale of Morningness; PHQ-9—Patient Health Questionnaire.
