The first alarm can feel like a small act of cruelty. It goes off while your brain is still deep in night mode, and the school day demands you switch on anyway. For many teenagers, that mismatch is not a character flaw or a failure of “time management.” It is biology. During adolescence, the body’s internal clock shifts later, making it harder to fall asleep early, even when you know you should. Early school start times lock in early wake-ups, and sleep debt piles up through the week. “This is concerning, as chronic sleep deprivation not only affects well-being, but also has a measurable impact on mental health, physical development and the ability to learn,” says Oskar Jenni of the University of Zurich (UZH). A school schedule built around choice In northeastern Switzerland, one secondary school tried a different approach. At the Gossau Upper Secondary School in the canton of St. Gallen, students began working with a flexible schedule that let them shape when their day began. Schematic illustration of the old and the new …