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. 2021 Aug 16;3:721919. doi: 10.3389/fdgth.2021.721919

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Copyright © 2021 Lujan, Perez-Pozuelo and Grandner.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Ceiling effect in accuracy with wearable devices using PPG technology. (B) Potential novel metrics for sleep and wake measurement. (C) Strengths and weaknesses of consumer sleep technology.