Caffeine consumption, body mass index and sleep quality

Abstract

Introduction: Literature has increasingly shown the relation between sleep quality and factors such as caffeine consumption and body mass index (BMI). Objective: To verify the existence of statistically significant correlations between caffeine consumption and body mass index with the sleep quality of the study’s sample. Material and Methods: A study with 220 individuals was developed by applying Pittsburgh’s Sleep Quality Index (PSQI), collecting the anthropometric data and evaluating caffeine consumption. Results: There were statistically significant differences between the variables “caffeine consumption” and “sleep quality” (p-value < 0.05). Sleep duration and caffeine consumption were negatively correlated (p-value = 0.002; Rho = -0,207), indicating that an increase in the amount of caffeine consumed would lead to shorter sleep duration. On the other hand, there were no statistically significant correlations in sleep quality considering BMI (p-value > 0.05). Conclusion: Caffeine consumption correlated with sleep quality and not with BMI. Given the importance of sleep quality, it is essential to continue developing studies around this subject.