乳腺癌女性中的夜间疼痛与睡眠障碍：巴西队列的多维度横断面研究

Background and Objectives: Breast cancer is the most common malignancy among women in Brazil (41.89/100,000 women, 2023–2025) and is associated with high psychosocial morbidity. Sleep disturbances are frequent in this population and pain is a known contributor, but the time of day when pain occurs has rarely been considered, particularly in Latin American cohorts. This study aimed to assess the prevalence of self-reported nocturnal pain and its associations with insomnia, sleep quality, daytime sleepiness, obstructive sleep apnea (OSA) risk, anxiety, and depression in women with breast cancer.