Poor Sleep Quality Linked to Lower Academic Performance in Dental Students: A Cross-Sectional Study

Abstract

Introduction: Sleep is essential for both physical and mental health. Studies have shown that sleep problems are prevalent among university students. The purpose of this study was to investigate the association between sleep quality and academic performance among dental students at a Malaysian university. Methods: All dental students of the university were invited to participate in this cross-sectional study, which used a self-administered Pittsburgh Sleep Quality Index (PSQI) scale and the psychological health domain of the Lifestyle and Habits Questionnaire- Brief. The academic performance was determined by their Grade Point Average (GPA). Descriptive statistics, independent t-tests, Pearson’s Chi square test for independence, and ANCOVA tests were used to analyse the data. Results: A total of 341 students (233 females and 108 males) participated in the study, with 36.7% reporting poor sleep quality (PSQI > 5). There was a significant difference in academic performance between students with good and poor sleep quality. Controlling for gender and psychological health, poor sleep quality was associated with lower GPA in both preclinical (adjusted mean GPA: 2.84 for poor sleepers, 3.28 for good sleepers, P < 0.001) and clinical year students (adjusted mean GPA: 2.99 for poor sleepers, 3.13 for good sleepers, P = 0.003). Conclusion: Dental students with poor sleep quality performed worse academically than students with good sleep quality after controlling for gender and psychological health. This finding was consistent in both the preclinical and clinical phase groups.