Mood correlates with circadian alignment in healthy individuals

A later dim light melatonin onset relative to midsleep is associated with worse mood.

• Circadian alignment, measured by the phase angle difference, correlates with mood.
• Shorter phase angle differences indicate a misalignment of the circadian pacemaker and sleep timing.
• Worse mood scores were observed with later dim light melatonin onset.
• No significant mood score differences were found between female and male participants.
• The findings align with previous research on mood and circadian rhythms in individuals with mood disorders.

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