1. Department of Quality of Life, Spirituality, and Coping, Center of Integrative Medicine, Faculty of Healthy, Witten/Herdecke University, 58313 Witten, Germany
2. Division of Sleep Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02215, USA
3. Department of Internal and Complementary Medicine, Immanuel Hospital Berlin and Institute of Social Medicine, Epidemiology & Health Economics, Charite-University Medical Center, 14109 Berlin, Germany
4. Group Health Research Institute, Group Health Cooperative, Seattle, WA 98101, USA
5. Patanjali Research Foundation, Uttarakhand, Haridwar 249405, India