. 2015 Aug 16;2015:201039. doi: 10.1155/2015/201039
Copyright © 2015 Lidia Hyla-Klekot et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Characteristics of the sleep.