Simbolon, P., Saragih, H. and Marantika Br. Barus, E. J. (2023) “The Relationship between Sleep Pattern Disorders and Learning Concentration of Level 3 Nurse Students at STIKes Santa Elisabeth Medan”, Jurnal EduHealth, 14(02), pp. 733–737. Available at: https://ejournal.seaninstitute.or.id/index.php/healt/article/view/2030 (Accessed: 6 October 2026).