The Relationship Between Sleep Patterns and the Level of Concentration in Learning of Grade 12 Students at SMAN 6, South Tangerang City. JKSIB [Internet]. 2025 Mar. 19 [cited 2026 Apr. 20];6(2):132-9. Available from: https://jurnal.stikesimcbintaro.ac.id/index.php/djs/article/view/198