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. 2017 Apr 19;11:188. doi: 10.3389/fnhum.2017.00188

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Copyright © 2017 Evans, Kelley and Kelley.

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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Time of day 1 feels at their best: 5 a.m.? 6 a.m.? …etc…(24 separate questions). Mean ± one standard deviation (standard error of the mean is around 2 points). US undergraduates; N approximately 190, varying slightly by question.