Ishaq, N.; Iqbal, Z.; Zaidi, S. U.; Tufail, S.; Mahtab, F.; Qammar, S. M. Comparison of Caffeine and Nicotine on Sleep Quality of Male Medical Students of Quaid-E-Azam Medical College, Bahawalpur. Proceedings S.Z.M.C 2026, 40, 208-213.