Daytime Sleep-Tracking Performance of Four Commercial Wearable Devices During Unrestricted Home Sleep.

"Disclosure The authors report no conflicts of interest in this work."

"This research was funded by the Office of Naval Research, Code 34. The authors wish to thank Prayag Gordy for support with data analysis and visualization, and Liliya Silayeva, PhD, for helpful comments on the manuscript and project management support. Rachel R. Markwald is an employee of the US Government. This work was prepared as part of her official duties. Title 17, USC. §105 provides that copyright protection under this title is not available for any work of the US Government. Title 17, USC. §101 defines a US Government work as work prepared by a military service member or employee of the US Government as part of that person’s official duties. Report No. 22–81 was supported by the Office of Naval Research, Code 34, under work unit no. N1701. The views expressed in this article reflect the results of research conducted by the authors and do not necessarily reflect the official policy or position of the Department of the Navy, Department of Defense, nor the US Government. The study protocol was approved by the Naval Health Research Center Institutional Review Board in compliance with all applicable federal regulations governing the protection of human subjects. Research data were derived from an approved Naval Health Research Center Institutional Review Board protocol, number NHRC.2017.0008."