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. 2020 Sep 17;238(1):83–94. doi: 10.1007/s00213-020-05660-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Proportions of sleep stages over the course of the night across all participants. The first epoch of sleep has been aligned between participants, to make it start at the same point in time. (a) Combined proportions of N2 and N3 sleep. (b) Proportions of REM sleep