A cross-sectional epidemiological study of the relationship between sleep duration, quality, and rhythm and presenteeism in workers.

"Declarations Conflict of interestAll authors declare that there is no conflict of interest. Research involving human participants and/or animalsAll procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This article does not contain any studies involving animals performed by any of the authors. Ethics approvalThe study was approved by both the ethics committee of Oita University Faculty of Medicine (Permission Number: 1208) and the ethics committee of Nihon University School of Medicine (Permission Number: 29-12-0). Informed consentInformed consent was obtained from all individual participants involved in the study. Conflict of interest All authors declare that there is no conflict of interest."

"The authors thank all participants and colleagues for this study. This work was supported by JSPS KAKENHI Grant Numbers 18K10067 and 17K18155."