Introduction: The frequent uses of electronic media among young people such as computers, television, mobile phones, game consoles are raising the debate that to what extent this might have an adverse effect on health. In the systematic reviewed paper of 67 scientific articles, 90% of them had claimed that screen time is adversely associated with sleep outcomes among adolescents. Recent studies suggest that one in five children and young adolescents have sleep difficulties, and this high prevalence requires public health concern.

Purpose: The inconsistency of sleeping time during weekdays and free days impacting on social and biological time is scientifically described as “social jetlag”. The overall aim of this study is whether there is an association of screen time and nighttime texting with social jetlag among adolescents aged 13 to 15 in Sweden.

Methods: This study has been conducted using the quantitative data from a larger research project (ISRCTN17006300) performed as a cross-sectional survey collected from all schools with grades 7 and 8 in four municipalities in southern Sweden. The sample consists of 1518 students (72.7% response rate), of which 50.7% were girls. Ages varied between 13 and 15 years (mean = 13.9, SD = 0.4).

Results: Social jetlag was defined as more than 2-h difference between bedtime and wake-up time during school days and weekends. The prevalence of social jetlag among this study population was 53.9% (n = 1425, 93.9%). In the multivariate binary logistic regression analysis after adjusting for age, sex, and economic status screen time (p < .001), texting at night (p = .002) was statistically significantly associated with social jetlag.

Conclusion: Irregular bedtime and wake-up habits during school days and weekends are associated with night-time texting and increased screen time. For future research, more focus should be given to find the causality and understand the magnitude of this problem while to develop appropriate public health message and intervention programs.