Effect of caffeine consumption on sleep quality of undergraduate medical students of Multan

  • Ghulam Mujtaba Nasir
  • Jawad Ahmad Nishtar Medical University Multan
  • Arooma Aziz
  • Hamza Hussain
  • Rehab Zafar
  • Arfa Iqbal
Keywords: Caffeine consumption, Medical students, Quality of sleep


Background: Caffeine is extensively utilized as a stimulant of the central nervous system by more than 80% of the world’s population. About 94% of medical students are reported using caffeine which is likely to have a detrimental impact on sleep quality. The purpose of the study was to evaluate the relationship between caffeine consumption and sleep quality among non-obese. undergraduate medical students

Subjects and methods: An Observational cross-sectional comparative study was carried out at Nishtar Medical University, Multan during the months of November and December 2022.Total 83, both male and female, non-obese undergraduate medical students (18-23 years old, BMI=18.5-24.9) selected by simple random sampling were included in this study, and they were divided into 3 groups on the basis of low (58 ± 29 mg/day), moderate (143±25 mg/day) or high (351±139 mg/day) caffeine consumption daily. Caffeine Consumption Questionnaire (CCQ) and Pittsburgh Sleep Quality Index Scale (PSQI) were used to assess the daily caffeine consumption (mg/day) and sleep quality, respectively. IBM SPSS-26 was used for data analysis. Mann-Whitney U test and Spearsman’s rho correlation were applied.

Results: PSQI scores were high [11(8─16)] in highly caffeinated participants, moderate [7(5─9)] in moderately caffeinated participants, and low [3(1─6)] in low caffeinated [3(1─6)] participants (p=0.000). Low-caffeinated subjects had lower PSQI scores compared to moderately and highly caffeinated subjects (p=0.000 and p=0.000, respectively). PSQI scores in moderately caffeinated were also less as compared to highly caffeinated (p=0.000). Within the low caffeinated, moderately caffeinated, and highly caffeinated subjects caffeine consumption was positively correlated to PSQI scores (r=0.529, p=0.004), (r=0.579, p=0.002), (r=0.592, p=0.001) respectively.

Conclusion: Increase in Caffeine consumption reduces sleep quality, implying that caffeine consumption and sleep quality are inversely related to each other.

How to Cite
Nasir G, Ahmad J, Aziz A, Hussain H, Zafar R, Iqbal A. Effect of caffeine consumption on sleep quality of undergraduate medical students of Multan. J Fatima Jinnah Med Univ [Internet]. 11Mar.2023 [cited 3Jun.2023];16(3):102-6. Available from: https://jfjmu.com/index.php/ojs/article/view/990