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Abstract : Nomophobia might be hazardous for medical students in terms of academic performance, accidents due to loss of concentration, and poor social relationships. This study aimed to assess nomophobia, excessive daytime sleepiness, sleep habits, and meal timing among medical students in Tabuk. A cross-sectional descriptive study was conducted among the clinical phase medical students in Tabuk City Saudi Arabia during the period from January to April 2021. A structured questionnaire based on demographic data, sleep and wakeup time and sleep duration during the working days and weekends, subjective sleepiness during class sessions, and using the phone during lectures, labs, and clinical rounds, and nomophobia questionnaire was used. The frequency of breakfast skipping and late dinner consumption and sleep latency was also recorded. Out of 111 students (98.2% were homophobic and 89.2% reported excessive daytime sleepiness), breakfast skipping was found in 44.1%, late dinner intake in 64.8%), while 89.2% used their phones during class sessions. Daytime sleepiness was associated with chronotype (P<0.05), no association was found with BMI, nomophobia, and breakfast skipping (P>0.05). Nomophobia, subjective daytime sleepiness, using mobile phones during lectures, and inappropriate meal and sleep timing were common among medical students in Tauk City, Saudi Arabia. Chronotype was associated with daytime sleepiness, no association was evident regarding other factors. Larger multi-center studies assessing the sleep and meal pattern (Chrono nutrition) and nomophobia effects on academic performance are needed.

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