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Circadian preferences influence typical patterns of alertness and sleep timing across the day. The Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ) is a brief self-report measure used to estimate an individual’s tendency toward morningness or eveningness.
The instrument includes 19 items covering preferred sleep-wake timing, periods of peak alertness, and daily activity scheduling, and typically takes about 4 minutes to complete. Responses yield a score that can be interpreted along a morning-to-evening preference continuum and may be used to inform clinical case formulation, sleep-focused assessment, or research on chronotype. The Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ) should be interpreted in the context of current sleep patterns, work/school demands, and relevant clinical history.