Association between indoor noise level at night and objective/subjective sleep quality in the older population: a cross-sectional study of the HEIJO-KYO cohort.

"Disclosure Statement Nonfinancial disclosure: None."

"Funding This work was supported by Department of Indoor Environmental Medicine, Nara Medical University; JSPS KAKENHI (grant numbers: 24790774, 22790567, 25860447, 25461393, 15H04776, 15H04777, 18H06396, 18K15899, 16K09478, 18K11008, 19H03903, 19K21475, and 20K10476); Mitsui Sumitomo Insurance Welfare Foundation; Meiji Yasuda Life Foundation of Health and Welfare; Osaka Gas Group Welfare Foundation; Japan Diabetes Foundation; Daiwa Securities Health Foundation; Japan Science and Technology Agency; Takeda Science Foundation; YKK AP, Inc; Ushio, Inc; Nara Prefecture Health Promotion Foundation; Nara Medical University Grant-in-Aid for Collaborative Research Projects; Tokyo Electric Power Company; EnviroLife Research Institute Co, Ltd.; Sekisui Chemical Co, Ltd.; LIXIL Corp; KYOCERA Corp; ENDO Lighting Corp; KANEKA Corp; and Sompo Japan Nipponkoa Welfare Foundation. The funders had no involvement in the study design, data collection and analysis, decision to publish, and preparation of the manuscript. Drs. K.O and K.S received research grants from YKK AP, Inc, Ushio, Inc, Tokyo Electric Power Company, EnviroLife Research Institute Co, Ltd, Sekisui Chemical Co, Ltd, LIXIL Corp, and KYOCERA Corp; ENDO Lighting Corp; and KANEKA Corp. The other authors report no conflicts of interest."