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. 2019 Feb 5;10:66. doi: 10.3389/fneur.2019.00066

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Copyright © 2019 Gorlova, Ichiba, Nishimaru, Takamura, Matsumoto, Hori, Nagashima, Tatsuse, Ono and Nishijo.

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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Parameters correlated with fatigue as determined by the visual analog scale at wake time (Fatigue VAS at waketime). (A) Correlation with the stageN3 duration in sleep cycle 1 (stageN3 duration in cycle 1). (B) Correlation with the mean difference distal-proximal gradient (dDPG) from 30 to 250 min after sleep onset (dDPG_30–250 min). (C) Correlation with the mean natural-log transformed total power from 0 to 30 min after sleep onset (Ln TP_0–30 min). (D) Correlation with the rapid eye movement (REM) latency.