Verification of sleep scales as predictors of suicidal ideation in Japanese dayworkers: a longitudinal study.

"Declarations Conflict of interestAll authors declare that they have no conflicts of interest. Ethical approvalThis study was approved by the ethics review board at Kurume University (approval No. 12065). All 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 with animals performed by any of the authors. Informed consentInformed consent was obtained from all individual participants included in the study. Conflict of interest All authors declare that they have no conflicts of interest."

"Funding There is no funding sources."