New national data shows that teens across the U.S. are sleeping far less than they used to — and the trend is accelerating. A new analysis from UConn researcher T. Greg Rhee, published in JAMA, reveals that more than half of teens now report getting under five hours of sleep per night, a level associated with emotional, cognitive, and physical health risks. The percentage of teens getting the recommended eight hours has dropped sharply since 2007, and the decline spans all demographic and behavioral groups. Researchers argue that societal factors — from school schedules to evening demands — may be driving the crisis and call for population‑level interventions.

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