Introduction: Inadequate sleep among undergraduate students might have an impact on their bodies and everyday activities. This study aims to investigate the association of physical activity and dietary behaviour on sleep quality among students of Faculty of Architecture, Planning, and Surveying in UiTM Selangor. Method: This research was conducted using a cross-sectional research and convenience sampling. The data were collected through the use of self-administered questionnaires from May to June 2022. Data analysis was done using Statistical Analysis Package for Social Sciences (SPSS) version 20.0. Results: A total of 321 students responded the questionnaire. The prevalence of poor sleep quality among undergraduate students of Faculty of Architecture, Planning and Surveying was 93.5%. It was found that physical activity was not associated (p>0.05) with sleep quality using Pearson’s Chi-square test. Pearson’s Chi-square test revealed that sleep quality was associated (p<0.05) with dietary behaviour which is Western fast food, sweets, water and breakfast skipping, gender, years of study and residential. Conclusion: This study revealed a high prevalence of poor sleep quality among students of Faculty of Architecture, Planning and Surveying. This information may be helpful in creating programs to treat and promote good sleep hygiene practices that may improve students’ physical and mental health.