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2025. Frequency of Tahajjud Prayer and Its Impact on Sleep Quality Among Elderly People in Karang Werda, Jember Regency. Jurnal Penelitian Sekolah Tinggi Ilmu Kesehatan Nahdlatul Ulama Tuban. 7, 1 (Jun. 2025). DOI:https://doi.org/10.47710/jp.v7i1.693.