Relationship between Psychological Capital and Sleep Quality in Intensive Care Unit Nurses

Background: Adequate sleep is essential for proper mental function. The aim of this study was to investigate the relationship between the intensive care unit nurses' psychological capital and their quality of sleep.   Methods: This was a descriptive correlational study. The study sample included 200 nurses from the educational medical centers affiliated to Iran University of Medical Sciences who were selected through proportional stratified sampling. The data were collected in 2021 by McGee's Psychological Capital Questionnaire (PCQ) and the Pittsburgh Sleep Quality Index (PSQI) and were analyzed using frequency, mean, and standard deviation and Pearson correlation coefficient   in SPSS 16. Significance level was set at 0.05.    Results:  There was a significant negative relationship between psychological capital subscales and the components of sleep quality (p<0.05). There were significant relationships between   psychological capital and nurses’ working hours (p <0.001), work experience (p = 0.04) and work experience in the intensive care unit (p = 0.03).  Also there were significant relationships between sleep quality and the nurses’ shift work status (p <0.001) and work experience (p = 0.04).   Conclusion: Improving the quality of sleep was associated with increasing the score of psychological capital and its components. Therefore, it is necessary for intensive care unit nurses to have adequate and quality sleep to improve performance and success at work.