Impact of living environment on sleep quality in older adults and the mediating role of depression: a cross-sectional study. - Sun, Jiayi; Yang, Ming; Liu, Sicheng; Zhang, Xiange; Xu, Wangquan; Peng, Juanjuan; Song, Yueli; Wang, Li; Fang, Guixia (Sleep & Biological Rhythms, 2025)