Helen, Millya, and Rina Mariyana. “Progressive Muscle Relaxation As a Non Pharmacological Intervention For Mild-Insomnia in Adolescents”. REAL in Nursing Journal 8, no. 2 (August 30, 2025): 153–160. Accessed January 26, 2026. https://ojs.ufdk.ac.id/index.php/Nursing/article/view/3038.