Social jetlag and eating habits linked to sleep quality and daytime sleepiness in Japanese high school students

Social jetlag of more than 2 hours is associated with extremely poor sleep quality and excessive daytime sleepiness in Japanese high school students.

• A total of 756 Japanese high school students were assessed for sleep quality and daytime sleepiness.
• Sleep quality was evaluated using the Pittsburgh Sleep Quality Index, while daytime sleepiness was measured with the Pediatric Daytime Sleepiness Scale.
• Data included average sleep duration, social jetlag, and meal timing on school versus non-school days.
• Social jetlag was linked to differences in the timing of the first meal between weekdays and weekends.
• Reducing social jetlag to within a 2-hour window may help in preventing poor sleep quality and excessive daytime sleepiness.

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