. 2019 May 11;21(6):e13482. doi: 10.2196/13482
©Zhongxing Zhang, Christian Cajochen, Ramin Khatami. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 11.05.2019.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.
Figure 2.
The distribution of the duration (>0 minutes) of daytime naps.