Abbreviations: P: p-values (2-tailed); t1: 1 semester after almost exclusively remote schooling (February 3rd to February 28th 2021); t2: at the begin of the second semester of reopened schools (14th September 2021 to 14th November 2021);; ISI: Insomnia Severity Index, GAD-7: Generalized Anxiety Disorder 7 scale; PHQ-9: Patient Health Questionnaire 9 scale; WHO-5: Well-being questionnaire of the World Health Organization (WHO); Cohen’s d was calculated as an effect size measure for differences (small effect: 0.2 to 0.5, medium effect: 0.5 to 0.8, large effect: >0.8). CI: 95% confidence interval.