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Objective: Evidence on the relationship between sleep duration and irregularity in daily energy intake with diet quality in Iranian adults is scarce. We aimed to evaluate the association of sleep duration with diet quality and irregularity in daily energy intake. Design: This is s cross-sectional study Setting: The study was carried in health care centers in Tehran. Participants: 739 adults aged 20-59 years were recruited. Dietary intake was assessed by a food frequency questionnaire and three, 24-h dietary recalls. Diet quality was assessed using the Healthy Eating Index-2015 (HEI-2015). An irregularity score of daily energy intake was calculated based on the deviation from the 3-day mean energy intake. Sleep duration was estimated using self-reported nocturnal sleep duration by each person. Results: Mean age of study participants was 44.4±10.7 years; 70% were women. The mean of nocturnal sleep duration, HEI score, and irregularity score were 6.7±1.22 hours/day, 52.5±8.55, and 22.9+19, respectively. After adjusting for potential confounders, sleep duration was not associated with adherence to HEI-2015 (OR: 1.16; 95% CI: 0.77-1.74). Longer sleep duration was marginally associated with a lower odd of irregularity in daily energy intake. However, after adjustment for various confounders, this association was not significant (OR: 0.82; 95% CI: 0.50-1.33; P trend=0.45). No significant interaction was observed between sleep duration and irregularity in daily energy intake in relation to adherence to HEI-2015 (P-interaction= 0.48). Conclusions: We found that sleep duration was not associated with adherence to HEI-2015 and irregularity in daily energy intake. Further prospective studies are warranted.

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