title: Sleep Hygiene Practices and Their Relation to Sleep Quality in Medical Students of Qazvin University of Medical Sciences.
abstract: BACKGROUND
  Poor quality of sleep is a distressing and worrying condition that can disturb academic performance of medical students. Sleep hygiene practices are one of the important variables that affect sleep quality. The objective of this study was to assess association between sleep hygiene practices and sleep quality of medical students in Qazvin University of Medical Sciences.
  
  
  METHODS
  In this descriptive-correlational study, a total of 285 medical students completed a self-administered questionnaire. Demographic data, sleep-wake schedule in weekday and weekend, and sleep duration were collected. Students' sleep quality was assessed by Pittsburg Sleep Quality Index (PSQI). Data were analyzed by SPSS Ver 13.
  
  
  RESULTS
  Overall, 164 (57.5) of students had poor sleep quality. Mean global PSQI score and average score of four subscales were significantly higher in male than female. Regression analysis showed that male students (β=-0.85, P<0.05), students at senior level (β=-0.81, P<0.05), married students (β=-0.45, P<0.05), and those with improper sleep hygiene practices slept worse.
  
  
  CONCLUSIONS
  The findings of this study showed that the prevalence of poor sleep quality in medical students is high. Improper sleep hygiene behaviors might be a reason for poor quality of sleep in medical students.
authors.affiliation: Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.
authors.forename: Zohreh
authors.initials: Z
authors.lastname: Yazdi
authors.affiliation: Industrial Diseases Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
authors.forename: Ziba
authors.initials: Z
authors.lastname: Loukzadeh
authors.affiliation: Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.
authors.forename: Parichehr
authors.initials: P
authors.lastname: Moghaddam
authors.affiliation: Children Growth Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.
authors.forename: Shabnam
authors.initials: S
authors.lastname: Jalilolghadr
keywords: Medical students; Sleep hygiene practice; Sleep quality