Daytime Sleepiness, Circadian Preference, Caffeine Consumption and Khat Use among College Students in Ethiopia

May 13, 2014Journal of sleep disorders-- treatment & care

Daytime Sleepiness, Body Clock Type, Caffeine Use, and Khat Use among Ethiopian College Students

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Abstract

Daytime sleepiness was present in 26% of Ethiopian college students.

The prevalence of daytime sleepiness was found to be 26%, with similar rates in males (25.9%) and females (25.5%).
Only 0.8% of students were classified as evening chronotypes, with slight differences between genders (0.7% females, 0.9% males).
Khat consumption, excessive alcohol use, and cigarette smoking were associated with an evening chronotype.
Caffeine consumption was linked to higher odds of evening chronotype, with an odds ratio of 2.18.
Khat use significantly increased the odds of being classified as an evening chronotype, with an odds ratio of 7.43.

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OBJECTIVES: To estimate the prevalence of daytime sleepiness and circadian preferences, and to examine the extent to which caffeine consumption and Khat (a herbal stimulant) use are associated with daytime sleepiness and evening chronotype among Ethiopian college students.

METHODS: A cross-sectional study was conducted among 2,410 college students. A self-administered questionnaire was used to collect information about sleep, behavioral risk factors such as caffeinated beverages, tobacco, alcohol, and Khat consumption. Daytime sleepiness and chronotype were assessed using the Epworth Sleepiness Scale (ESS) and the Horne & Ostberg Morningness /Eveningness Questionnaire (MEQ), respectively. Linear and logistic regression models were used to evaluate associations.

RESULTS: Daytime sleepiness (ESS≥10) was present in 26% of the students (95% CI: 24.4-27.8%) with 25.9% in males and 25.5% in females. A total of 30 (0.8%) students were classified as evening chronotypes (0.7% in females and 0.9% in males). Overall, Overall, Khat consumption, excessive alcohol use and cigarette smoking status were associated with evening chronotype. Use of any caffeinated beverages (OR=2.18; 95%CI: 0.82-5.77) and Khat consumption (OR=7.43; 95%CI: 3.28-16.98) increased the odds of evening chronotype.

CONCLUSION: The prevalence of daytime sleepiness among our study population was high while few were classified as evening chronotypes. We also found increased odds of evening chronotype with caffeine consumption and Khat use amongst Ethiopian college students. Prospective cohort studies that examine the effects of caffeinated beverages and Khat use on sleep disorders among young adults are needed.

Daytime Sleepiness, Circadian Preference, Caffeine Consumption and Khat Use among College Students in Ethiopia

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