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. 2018 May 15;9:688. doi: 10.3389/fpsyg.2018.00688

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Copyright © 2018 Rodríguez-Morilla, Madrid, Molina, Pérez-Navarro and Correa.

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 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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Example of mean circadian rhythm of TAP (modified from Ortiz-Tudela et al., 2010). The violet line represents the mean waveform of TAP rhythm (value ± SEM, in arbitrary units from 0 to 1) obtained from the week recordings of wrist temperature, motor activity and body position of a sample of 49 subjects. The shaded blue area corresponds to sleep declared by subjects. The five consecutive hours of lowest values (L5) are marked by the horizontal dark blue line. The central time of that period (4:15 h approximately) is considered as midsleep time.