Abstract
Introduction: Nurses' job satisfaction is a serious issue for health care systems, so that decreased job satisfaction can cause problems for nurses and the health systems. Job satisfaction can be affected by sleep quality and morningness /eveningness chronotypes the morningness-eveningness preference (chronotypes) of the nurses. The present study aimed to determine the predictive power of job satisfaction by sleep quality and morningness /eveningness chronotypes of nurses working in Urmia educational hospitals in 2019.
Methods: Simple random sampling method was conducted and 327 nurses were selected from  five educational hospitals affiliated to Urmia University of Medical Sciences to participate in the study.  Data were collected using demographic information questionnaires, Pittsburgh Sleep Quality Index, Minnesota Satisfaction Questionnaire, and Composite Scale of Morningness. Data were analyzed using descriptive statistics, measures of central tendency, Pearson correlation coefficient, independent samples t-test, two-way ANOVA, and linear regression analysis. All statistical analyseis were conducted using SPSS software version 16.0 (SPSS Inc., Chicago, Ill., USA).
Results: The findings of linear regression analysis and Pearson correlation coefficient indicated a significant correlation between job satisfaction and sleep quality in nurses. In other words, an improvement in sleep quality leads to higher job satisfaction (P <0.01), so that sleep quality is one of the predictors of job satisfaction (P = 0.002). However, no significant correlation was found between the nurses’ job satisfaction and their morningness-eveningness chronotypes (P> 0.01).
Conclusion: Nurses with higher levels of sleep quality had higher job satisfaction, although the morningness-eveningness chronotypes of nurses had no significant effect on their job satisfaction.