KANAGALA, D. A. .; DR. ANKUR. Effect of smartphone screen time on sleep quality and daytime alertness: A cross-sectional observational study. Student’s Journal of Health Research Africa, Africa, v. 7, n. 3, p. 11, 2026. DOI: 10.51168/sjhrafrica.v7i3.2379. Disponível em: http://sjhresearchafrica.org/index.php/public-html/article/view/2379. Acesso em: 1 may. 2026.