Flexible High School Schedules Lead to Increased Sleep and Improved Academic Outcomes, University of Zurich Study Finds

A University of Zurich study shows flexible school starts help teens sleep 45 minutes longer, improving math and English scores while boosting mental health.

By: AXL Media

Published: Feb 27, 2026, 3:55 AM EST

Source: The information in this article was sourced from the University of Zurich

The Biological Mandate for Adolescent Sleep

A fundamental shift in adolescent sleep biology makes early school start times a significant barrier to student well-being. According to developmental pediatrician Oskar Jenni of the University of Zurich (UZH), teenagers are biologically wired to fall asleep later than adults, a shift that progresses throughout adolescence. This delay in the biological clock often leads to chronic sleep deprivation, as students are forced to wake up for early morning classes before their sleep needs are met. Chronic lack of sleep is not merely an issue of fatigue; it has documented impacts on physical development, mental health, and the cognitive ability to retain new information.

The Gossau Model: Innovation in Flexible Scheduling

To address the sleep deficit crisis, the Gossau Upper Secondary School in Switzerland introduced a flexible school model three years ago. This system allows students to choose between arriving at 7:30 am for early modules or waiting until the official start of classes at 8:30 am. Researchers Joëlle Albrecht, Reto Huber, and Oskar Jenni utilized this transition to conduct a comparative study on student health and performance. By surveying 754 responses from pupils with an average age of 14, the team was able to measure the direct impact of moving from a rigid 7:20 am start to a choice-based system.

Quantifying the Benefits of Later Starts

The results of the study were striking: 95% of students opted for the later start time, beginning their day on average 38 minutes later than under the old system. Contrary to concerns that students might simply stay up later at night, the data showed that they continued to go to bed at roughly the same time. Consequently, students gained an average of 45 minutes of additional sleep on school days. Lead author Joëlle Albrecht noted that this extra rest translated into fewer difficulties falling asleep and a measurable increase in health-related quality of life.