QIZI, Y. S. I. WHY DO STUDENTS FEEL TIRED EVEN AFTER SLEEPING? PSYCHOLOGICAL CAUSES OF MENTAL FATIGUE IN ADOLESCENTS. Research Focus International Scientific Journal, [S. l.], v. 5, n. 5, p. 166–172, 2026. Disponível em: https://refocus.uz/index.php/rf/article/view/2268. Acesso em: 12 jun. 2026.