Jet lag disorder occurs due to acute travel across time zones. Similar symptoms are evident when there exists a large discrepancy in the midpoint of sleep timing between free and work days. This difference is called social jetlag ; more than one or two hours of social jetlag is associated with both mental and physical health problems. A cross-sectional study in Germany showed that social jetlag peaked around 16-17 years to more than 3 hours. Therefore, social jetlag is an area of concern for adolescents. Social jetlag has been reported to be associated with poor academic performance, poor cognitive ability, obesity, long screen time, anxiety, sleepiness, irritability, poor sleep quality, less physical activity, breakfast skipping, and poor defecation habit among adolescents. This review introduces recent understanding on social jetlag, provides new insights on assumed problems linked to negative social jetlag, and raises current issues or future research direction on social jetlag.