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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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Changes in the electroencephalography powers during sleep. (A) Changes in the natural-log transformed beta power (Ln Beta). (B) Changes in the natural-log transformed sigma power (Ln Sigma). (C) Changes in the natural-log transformed alpha power (Ln Alpha). (D) Changes in the natural-log transformed theta power (Ln Theta). (E) Changes in the natural-log transformed delta power (Ln Delta). The inset indicates the difference in the mean natural-log transformed delta power from 30 to 65 min (red-colored shaded area) after sleep onset (Ln Delta_30–65 min) between the high fatigue group (HFG) and the low fatigue group (LFG). (F) Changes in the natural-log transformed ultra-slow power (Ln US). The inset indicates the difference in the mean natural-log transformed ultra-slow power from 30 to 65 min (red-colored shaded area) after sleep onset (Ln US_30–65 min) between the HFG and LFG. ^*p < 0.05, ^**p < 0.01, ^****p < 0.0001, respectively.