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. 2019 Sep 4;18:92. doi: 10.1186/s12938-019-0712-8

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — The values of Index_W, Index_N, and Index_R in the wake, NREM, and REM stages (1st to 200th epochs are wake, 201st to 400th epochs are NREM, and 401st to 600th epochs are REM). Blue line: the value of Index_W; red line: the value of Index_N; green line: the value of Index_R