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. 2021 Jun 1;9(6):e26462. doi: 10.2196/26462

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©Jing Wei, Jennifer Boger. Originally published in JMIR mHealth and uHealth (https://mhealth.jmir.org), 01.06.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mHealth and uHealth, is properly cited. The complete bibliographic information, a link to the original publication on https://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Example wrist temperature and AX3 data for a healthy older adult with irregular sleep (OA1). Sleep detected by the Mi Band 2 is indicated by the red double arrow. WT: wrist temperature.