Sleep disorders, sleep quality, and health-related quality of life in patients with cancer in Turkey: a multi-center cross-sectional survey.

Objectives: The present study aims to examine the frequency of sleep disorders and the level of sleep quality, as well as their relationship with health-related quality of life in cancer patients. Methods: This multi-center cross-sectional survey included 333 cancer patients ranging in age from 16 to 72 years, between June 15, 2017, and August 30, 2018 at the Ankara Oncology Hospital and Erciyes University Kemal Dedeman Oncology Hospital Polyclinic. Data were collected via various surveys conducted through face-to-face interviews, including following measurement tools: Short Form 36 Health Questionnaire, the Pittsburgh Sleep Quality Index, the Epworth Sleepiness, and the Berlin Sleep Questionnaire for obstructive sleep apnea. Face-to-face interviews were carried out with patients who presented for an initial examination or follow-up and were awaiting their appointments. Results: The most commonly reported sleep disorders were daytime sleepiness (36.9%), sleep respiratory disorders (34.8%), insomnia (29.4%), and parasomnias (28.8%). Good sleepers were found to have significantly higher physical (40.20±10.08 vs. 33.21±8.06; P<0.001) and mental component scores (43.54±8.25 vs. 38.20±7.52; P<0.001) than poor sleepers. Conversely, individuals with insomnia (P<0.01), daytime sleepiness (P<0.001), sleep-respiratory disorders (P<0.05), and bruxism (P<0.001) showed significantly lower scores in both physical and mental components. Additionally, those with restless legs syndrome had a significantly lower physical component score (P<0.001), and those with parasomnias had significantly lower mental component scores. Conclusion: Cancer patients exhibited moderate average sleep quality scores, with over half of them demonstrating low quality sleep patterns. Sleep disorders significantly impacted their health-related quality of life.