Relationship between sleep quality and quality of life in patients with bipolar disorder

Objective: Sleep disorder is one of the most classic symptoms of patients with bipolar I disorder (BID), which affects their quality of life (QOL). The current study aimed to determine the relationship between sleep quality and quality of life in patients with bipolar I. Methods: In this descriptive cross-sectional study, 180 patients with bipolar I disorder were selected using convenience sampling in Farshchian Psychiatric Center of Hamadan, Iran, in 2017. The data collection instruments were Pittsburgh Sleep Inventory and Brief Quality of Life Questionnaire. Data analysis was performed using Pearson's correlation coefficient and stepwise multiple regression by SPSS 23. Results: The results indicated that 41.1% and 54.4% of patients with bipolar I disorder experienced low level of sleep quality and QOL, respectively. There was a statistically significant relationship between sleep quality and QOL (r=-0.571, p<0.001), so that low sleep quality has a negative impact on the QOL in these patients. Discussion: Patients with bipolar disorder suffer from sleep disorder affecting their QOL. Therefore, it is suggested that treatment and care interventions be designed and implemented to improve sleep quality and patients' QOL. Moreover, treatment interventions of bipolar disorder are inseparable from the treatment of sleep disturbance.