Introduction: The mental health of nurses is crucial for the quality of healthcare, but is often compromised by high workloads, shift work and difficulties in balancing work and private life. Understanding the factors that contribute to better mental health in nurses is of great importance. Purpose: The aim of the study was to examine the relationship between nurses' mental health and shift work, sleep, and work-life conflict. Methods: A quantitative cross-sectional study was conducted with a non-random sample of 212 nurses in Slovenia (86% women, aged 19 to 63 years), who worked only day (37%) or also night shifts (63%). Standardized self-assessment questionnaires were used to measure the quantity and quality of sleep, the negative influence of work on private life, anxiety, depression and subjective well-being. The data were analyzed using descriptive statistics, correlations and regression models. Results: There were no statistically significant differences in anxiety, depression, and overall subjective well-being, sleep quality and quantity, and perceived negative influence of work-life on personal life between participating nurses who worked night shifts and those who did not. The total sleep score, which reflects sleep quality and quantity, was found to be a significant predictor of mental health, being associated with higher anxiety, higher depression, and lower subjective well-being. Perceived negative work-life influence was also associated with poorer mental health in nurses who worked night shifts. Discussion and conclusion: Although night shift work was not associated with mental health, perceived work-life influence, and sleep characteristics of participating nurses, the findings of the study highlight the important role of sleep and work-life balance in the mental health of nurses in Slovenia. The results represent a starting point for further research and for the design of measures aimed at strengthening the well-being of healthcare workers, regardless of the type of shift work. We propose measures aimed at improving sleep quality and supporting work-life balance of healthcare professionals.
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