The quality of sleep and factors associated with poor sleep in Japanese graduate students

  • Pallos H
  • Gergely V
  • Yamada N
 et al. 
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We conducted a cross-sectional mail questionnaire survey at 31 graduate schools on 12 university campuses in Kyoto, Japan to assess the sleep quality of the graduate students and to describe the factors associated with their poor sleep quality. A total of 241 responses were returned (44%) and we analyzed the data of 219 graduate students (158 men and 61 women, aged 22-39 years). The participants completed the self-reported Pittsburgh sleep quality index (PSQI) questionnaire, together with socio-demographic, psychological and lifestyle related questions. Using the conservative cut-off score of 6 for the PSQI global score, 25.6% of students (27.7% of the men and 20% of the women, without significant difference) were described as poor sleepers. A multiple logistic regression model revealed that poor sleep had a significant association with self-perceived bad health (OR = 3.72, 95% CI = 1.85-7.49, P = 0.0002) and with smoking (OR = 3.56, 95% CI = 1.62-7.84, P = 0.0016). As students often ignore their own sleep problems, sleep hygiene counseling with a holistic approach should be available at universities to raise students' awareness about the possible associations between their unhealthy lifestyles and their sleep problems. © 2007 The Authors; Journal compilation © 2007 Japanese Society of Sleep Research.

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  • H Pallos

  • V Gergely

  • N Yamada

  • S Miyazaki

  • M Okawa

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