Abstract
This study aimed to determine whether both subjective sleep quality and sleep duration are directly associated with quality of life (QOL), as well as indirectly associated with QOL through insomnia symptoms. Individuals aged 20–69 years without mental illness (n = 9305) were enrolled in this web-based cross-sectional survey. The Short Form-8 was used to assess physical and mental QOL. We used the Pittsburgh Sleep Quality Index (PSQI) and extracted items related to subjective sleep quality and sleep duration. Insomnia symptoms were also extracted from the PSQI. The hypothesized models were tested using structural equation modeling. Worse sleep quality, but not shorter sleep duration, was related to worse physical QOL. Both worse sleep quality and shorter sleep duration were related to worse mental QOL. Insomnia symptoms mediated these relationships. Subgroup analyses revealed a U-shaped relationship between sleep duration and physical/mental QOL. However, the relationship between sleep quality and physical/mental QOL was consistent regardless of sleep duration. The results suggest that subjective sleep quality has a more coherent association with QOL than subjective sleep duration. Because of its high feasibility, a questionnaire on overall sleep quality could be a useful indicator in future epidemiological studies of strategies for improving QOL.
Highlights
We examined the hypotheses in two models to assess the influence of sleep quality and sleep duration on physical quality of life (QOL) (A) and mental QOL (B)
The present study confirmed the hypothesis that overall sleep quality as a subjective measure, which is one confirmed the hypothesis that overall sleep quality as a subjective measure, which is one of the items of the Pittsburgh Sleep Quality Index (PSQI), significantly correlated with both physical and mental QOL, as of the items of the PSQI, significantly correlated with both physical and mental QOL, as well as being indirectly related through insomnia symptoms
The relationships between sleep quality and physical or mental QOL seemed more apparent than the relationships sleep quality and physical or mental QOL seemed more apparent than the relationships between sleep duration and physical or mental QOL, given that sleep quality had a conbetween sleep duration and physical or mental QOL, given that sleep quality had a consistent association with both physical and mental QOL across the subgroups of sleep dusistent association with both physical and mental QOL across the subgroups of sleep ration
Summary
Quality of life (QOL), defined as “an individual’s perception of their position in life in the context of the culture in which they live and in relation to their goals, expectations, standards and concerns [1],” is a well-established concept in the fields of health and medicine. QOL is useful for predicting treatment and intervention success, and can be used as a qualitative health indicator that goes further than biomedical outcomes, such as curing disease and survival [2]. There is a close relationship between sleep and QOL in patients with a variety of physical and psychiatric illnesses and sleep disorders, and in the general population in.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
