Published on in Vol 9, No 2 (2021): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/24704, first published
.
![Heart Rate Variability and Firstbeat Method for Detecting Sleep Stages in Healthy Young Adults: Feasibility Study Heart Rate Variability and Firstbeat Method for Detecting Sleep Stages in Healthy Young Adults: Feasibility Study](https://asset.jmir.pub/assets/9c165d36f51ae46c3477190b2052cbdf.png 480w,https://asset.jmir.pub/assets/9c165d36f51ae46c3477190b2052cbdf.png 960w,https://asset.jmir.pub/assets/9c165d36f51ae46c3477190b2052cbdf.png 1920w,https://asset.jmir.pub/assets/9c165d36f51ae46c3477190b2052cbdf.png 2500w)
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