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Intra-Individual Variability in Sleep Quality Among Coffee Consumers: A Cross-Sectional Study
Abstract
Background and Objective: Coffee is one of the most popular beverages in the world. Caffeine contained in coffee is a stimulant that acts on adenosine receptors to prevent sleepiness and promote alertness. In this study, we investigated the effect of coffee consumption on sleep quality of undergraduate students studying medicine. Materials and Methods: A cross-sectional study and convenient sampling method was used. A total of 350 students were enrolled and data were collected via a self-administered questionnaire based on the validated Pittsburgh Sleep Quality Index (PSQI) questionnaire. Results: The majority of students (73.1%) in this study consumed coffee, with instant coffee being the most preferred type. Coffee consumption was most frequent after 8 pm and the most common volume consumed daily was between 251 and 500 mL. The volume of coffee consumed daily was related to sleep quality. Conclusion: Although, coffee consumption had a non-significant impact on the quality of sleep among the total study population, we observed a large degree of intra-individual variability in the effects of caffeine.
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Coffee, depression, insomnia, medical students, sleep qualityArticle Metrics
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This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.
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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
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