Single‐item chronotype is associated with dim light melatonin onset in lymphoma survivors with fatigue

In a sample of 166 lymphoma survivors, the mean dim light melatonin onset was at 8:42 p.m..

• A single-item chronotype question was evaluated for its association with dim light melatonin onset.
• The most common chronotype reported was a preference for evening activities, noted in 29.2% of participants.
• Dim light melatonin onset increased gradually with later chronotype, ranging from 7:45 p.m. in definite morning persons to 9:16 p.m. in definite evening persons.
• The findings suggest that single-item chronotype assessment may provide a valid alternative to traditional questionnaires in estimating circadian phase.

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