Associations Between Morningness-Eveningness and Sleep Quality Among Female Dormitory Residents

Background: Variations in diurnal preferences for activity and sleep are classified as morning and evening chronotypes. Morning and evening-type individuals differ regarding a number of psychological and biological variables such as sleep. Objectives: The current study aimed to investigate the relationship between chronotypes and sleep quality. Patients and Methods: In this descriptive, correlational study, 159 university girl students were studied. Horne-Ostberg Mornigness-Eveningness Questionnaire (MEQ) and Pittsburgh Sleep Quality Index (PSQI) were used to assess chronotypes and sleep quality respectively. The data were analyzed using descriptive and Pearson’s linear correlation coefficient tests by SPSS software version 16. Results: Over 60% of the students were categorized as poor-quality sleepers by the PSQI, 69.2%, 27.5%, and 3.2% of the subjects were intermediate, evening, and morning types, respectively. There was a significant negative correlation between MEQ and PSQI scores and its dimensions such as subjective sleep quality, sleep latency, sleep duration, and sleep efficiency (P 0.05); while there were no significant differences between sleep disturbances, daytime dysfunction, use of sleep medication, and MEQ scores. Conclusions: The results showed that the quality of evening type sleep was worse than that of the morning type.