Publication date: Jul 09, 2025
The COVID-19 pandemic significantly disrupted adolescents’ routines, including their sleep patterns, due to school closures, social isolation, and increased screen time. As routines normalized post-pandemic, understanding whether these changes persisted or reverted to pre-pandemic levels is essential. To compare sleep variables between the periods before and after the COVID-19 pandemic in samples of Brazilian adolescents. A repeated cross-sectional study with a nested cohort targeting high-school students from Southern Brazil was used. Different sleep variables were obtained from wrist-worn accelerometers and validated questionnaires. Generalized linear mixed models with Gaussian distribution and identity link function were used to compare sleep variables between the survey years. In 2019, 674 adolescents participated (51. 8% female, mean age = 16. 3, SD = 1. 1), and in 2022, 625 participated (56. 3% female, mean age = 16. 5, SD = 1. 2). In the longitudinal sample, 242 out of 333 eligible participants provided complete data in 2019, and 138 out of 286 agreed to participate in 2022. Cross-sectional data indicate significant differences for social jet lag (β: -0. 28, p
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| Concepts | Keywords |
|---|---|
| Jet | Accelerometry |
| Pandemic | Sleep efficiency |
| Sleep | Sleep timing |
| Students | Sleep-related behaviors |
| Sleepiness | |
| Youth |
Semantics
| Type | Source | Name |
|---|---|---|
| disease | MESH | COVID-19 pandemic |
| disease | MESH | jet lag |
| pathway | REACTOME | Reproduction |
| drug | DRUGBANK | Coenzyme M |
| disease | MESH | Obesity |
| disease | MESH | Sleepiness |