The association of sleep and late‐night cell phone use among adolescents

Objective: This study aims to assess the relationship of late‐night cell phone use with sleep duration and quality in a sample of Iranian adolescents. Methods: The study population consisted of 2400 adolescents, aged 12–18 years, living in Isfahan, Iran. Age, body mass index, sleep duration, cell phone use after 9 p.m., and physical activity were documented. For sleep assessment, the Pittsburgh Sleep Quality Index questionnaire was used. Results: The participation rate was 90.4% (n = 2257 adolescents). The mean (SD) age of participants was 15.44 (1.55) years; 1270 participants reported to use cell phone after 9 p.m. Overall, 56.1% of girls and 38.9% of boys reported poor quality sleep, respectively. Wake‐up time was 8:17 a.m. (2.33), among late‐night cell phone users and 8:03 a.m. (2.11) among non‐users. Most (52%) late‐night cell phone users had poor sleep quality. Sedentary participants had higher sleep latency than their peers. Adjusted binary and multinomial logistic regression models showed that late‐night cell users were 1.39 times more likely to have a poor sleep quality than non‐users (p‐value < 0.001). Conclusion: Late‐night cell phone use by adolescents was associated with poorer sleep quality. Participants who were physically active had better sleep quality and quantity. As part of healthy lifestyle recommendations, avoidance of late‐night cell phone use should be encouraged in adolescents