Objective: This study's main objectives are to examine the prevalence of smartphone usage at bedtime and its effect on sleep quality among Saudi non-medical staff working in King Saud University medical city in Riyadh, Saudi Arabia. Methods: This cross-sectional study was carried out over the period from January 2016 to July 2016 A sample of 435 Saudi adults aged 21 years and above working in King Saud University Medical City in Riyadh, Saudi Arabia participated in a self-reported Arabic questionnaire about bedtime usage of smartphone and sleep quality. Sleep quality was measured using the Pittsburgh Sleep Quality Index (PSQI). Data were analyzed using odds ratio. Results: More than 98% of the respondents owned a smartphone, and nine out of ten use their smartphones at bedtime. Social media was the most used service among participants. An increase in bedtime smartphone use specially more than 60 minutes makes participants at great risk of having poor sleep quality. Conclusion: our findings suggest that employees who use their smartphones more at bedtime have more risk of being poor sleepers. More attention should be drawn to the misuse of smartphones and its effect sleep quality, health and productivity of adults.

Objectives: To study the prevalence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) after pandemic's peak and before the vaccine enrollment in Riyadh, Saudi Arabia and further explore predictors for SARS-CoV-2 positivity.