Psychological factors associated with poor sleep prior to breast surgery: an exploratory study.

This study explored the relationship between psychological factors (including intrusive thoughts, anxiety, well-being, depressed mood) and poor sleep the night before surgery. Patients (N = 39) scheduled for breast surgery (mean age = 47 years) wore an actiwatch at home the night before surgery to provide an objective indication of sleep duration and sleep efficiency. Participants also completed 3 measures of their psychological experience during the week prior to surgery. In separate regression analyses, intrusive thoughts, anxiety, and emotional well-being were each related to sleep duration the night before surgery, when controlling for age, body mass index, ethnicity, and marital status. No relationships were found between depressed mood, physical or social well-being, and sleep duration. In a multiple regression model that included all significant variables, intrusive thoughts were most strongly associated with sleep duration. Intrusive thoughts were also significantly related to sleep efficiency. Results suggest that patients' intrusions about impending surgery are associated with lower sleep duration and sleep efficiency the night before surgery. Additional research is warranted to explore the implications of these associations for patients, as well as possible interventions to improve sleep in this clinical setting.