Objective: Given the significance of sleep quality among pregnant women and its effects on the health of the fetus and the lack of sufficient studies in this field as well, the present study aimed to both identify some of the psychological factors associated with sleep quality among pregnant women and investigate the relationship between sleep quality among pregnant women and other variables, including depression, anxiety, stress, resilience, perceived social support, and marital adjustment.

Materials and methods: In this descriptive-correlational study, 425 pregnant women, visiting Islamabad and Ravansar–based prenatal care centers (randomly selected from the townships of Kermanshah Province (Iran)) in 2015, were selected. To collect the required data, the Locke-Wallace Marital Adjustment Test (LWSMAT), Pittsburgh Sleep Quality Index (PSQI), Conner-Davidson Resilience Scale (CD-RIS), Zimet’s Multidimensional Scale of Perceived Social Support (MSPSS), and depression, anxiety and stress scales were used.

Results: The results of data analysis demonstrated that there was a significant relationship between the quality of sleep and variables like depression, anxiety, stress, perception, social support and marital adjustment. Further, the results showed that the hierarchical regression of all variables could predict 31% of the changes of sleep quality. Additionally, anxiety, depression and stress were ranked first, second and third in terms of the shares of variables in predicting the quality of sleep. Whereas, resilience, perceived social support and marital adjustment were unable to predict the quality of sleep.

Conclusion: Given the results of the present study, it is suggested that the roles of the psychological factors be considered in improving the quality of sleep among pregnant women.