Ramakrishnappa, S., Anbazhagan, D., Kumarasamy, V., & Kumarasamy, V. (2020). Intra-Individual Variability in Sleep Quality Among Coffee Consumers: A Cross-Sectional Study. Pakistan Journal of Nutrition, 19(3), 146–152. https://doi.org/10.3923/pjn.2020.146.152