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. 2022 Sep 7;3(1):zpac028. doi: 10.1093/sleepadvances/zpac028

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© The Author(s) 2022. Published by Oxford University Press on behalf of Sleep Research Society.

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 reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Sleepiness on Karolinska Sleepiness Scale (KSS) at different times of day for groups with different sleep efficiency (SE) (right) and total sleep time (TST) (left).