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. 2018 Jan 10;11:648. doi: 10.3389/fnhum.2017.00648

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Copyright © 2018 Wiesner, Davoli, Schürger, Prehn-Kristensen and Baving.

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) or licensor 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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Melatonin response during nap correlates with subsequent learning. (A) Mean and SEM of saliva melatonin levels before and after an interval either with sleep in darkness (nap condition) or wake in bright light (video condition). The 90 min sleep/wake interval is indicated by the gray bar. (B) Correlation of the melatonin response with the learning performance after the sleep interval in darkness (nap condition) with a regression line. Note that the guessing frequency is 0.5 correct choices.