Document Type : Original Article


1 Student Research Committee, Babol University of Medical Sciences, Babol, Islamic Republic of Iran

2 Social Determinants of Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Islamic Republic of Iran


BACKGROUND: Sleep quality is an important factor in adolescents’ health; physical as well as
psychological. The aim of this study was to determine sleep quality and daytime sleepiness and their
effect on the quality of school life (QSL) and achievement.
MATERIALS AND METHODS: This cross‑sectional study was conducted in high schools. The data
collection was done on a random sample of 500 students from 15 to 19 years. The questionnaires
included the Pittsburgh Sleep Quality Index (PSQI) to measure sleep quality and the Epworth
Sleepiness Scale to measure daytime sleepiness as well as QSL. Data were analyzed by SPSS
25. Linear and logistic regressions were used to obtain adjusted and unadjusted odds ratios as well
as predictors.
RESULTS: The mean PSQI score was 6.2 ± 2.4. It was realized that 377 participants (75.4%)
were poor sleepers; 6.2% had excessive daytime sleepiness. There was a significant association
between age and quality of sleep (P < 0.04). No association between gender and quality of sleep
or between the quality of sleep and school achievement was found. Linear regression exhibited a
significant relationship between the quality of sleep and daytime sleepiness (β = 0.218; t = 4.982,
P = 0.000). There was a significant, inverse correlation between sleepiness and the total score of
QSL (P = 0.000). Stepwise linear regression analysis exhibited that daytime sleepiness (P = 0.002)
and school achievement (P = 0.001) were predictors of QSL.
CONCLUSION: According to the study results, sleepiness affects school performance and QSL,
and on the other hand, daytime sleepiness is under the effect of sleep quality.


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