2024 Yes The CLASS Study (Circadian Light in Adolescence, Sleep and School): protocol for a prospective, longitudinal cohort to assess sleep, light, circadian timing and academic performance in adolescence https://bmjopen.bmj.com/content/bmjopen/12/5/e055716.full.pdf Stone, Julia E. Australia Observational Students High School (9-12) Lighting Test performance Stress/Anxiety Other COVID-19 Child & adolescent psychiatry Mental health sleep medicine The CLASS Study tracks 220 adolescents over 2 years to assess how sleep-wake timing, circadian phase, and light exposure relate to academic performance and sleepiness. Findings may guide policies and interventions for secondary school students. 2022