Adolescents often experience a misalignment between their biological rhythms (chronotype) and societal schedules, leading to social jetlag, which may impact stress, resilience and well-being. This study investigated the relationships between chronotype, perceived stress, resilience, sleep quality and leisure activity choices among Brazilian high school students. Ninety 11th-grade students (aged 16–17) completed validated questionnaires assessing these factors. Most students exhibited an intermediate chronotype. While morning types reported lower stress, higher resilience and better sleep quality, evening chronotypes showed significantly higher stress, lower resilience and poorer sleep outcomes. Leisure activities varied by chronotype: morning types engaged more in physical activities and academic tasks, while evening types prioritised social interactions and entertainment. Gender differences were also evident, with girls reporting higher stress and lower resilience than boys. The findings underscore the influence of chronotype on adolescent well-being and highlight the opportunities for educational policies that consider biological rhythms. Addressing social jetlag through flexible school schedules and promoting structured leisure activities may enhance resilience, reduce stress and support healthier lifestyle habits in adolescents.
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