Objective: To describe smartphone use, sleep status and factors associated with poor sleep quality among students at Ca Mau Medical College.
Methods: An analytical cross-sectional study was conducted from January to March 2026. Of 650 students invited, 571 valid questionnaires were obtained; because only six students did not use smartphones, the main analysis was restricted to 565 smartphone users. Sleep quality was assessed by a 7-component index adapted from PSQI; Cronbach’s alpha was 0.887. Poor sleep quality was defined as a total score ≥6. Logistic regression estimated crude and adjusted odds ratios.
Results: Among 565 smartphone users, 40.88% used smartphones ≥5 hours/day, 90.62% used smartphones within one hour before sleep, and 53.45% kept phones near/on the bed. Poor sleep quality was found in 58.05%. Multivariable analysis showed significant associations with academic pressure, staying up late because of smartphone use and waking at night due to the phone.
Conclusion: Poor sleep quality was common. Smartphone-related bedtime behaviors should be addressed in student health education.