1. Department of Physics, Bar-Ilan University, Ramat Gan, Israel.
2. The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel.
3. The Leslie and Susan Gonda Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel.
4. Keck Laboratory for Network Physiology, Department of Physics, Boston University, Boston, MA 02215, USA.
5. Harvard Medical School and Division of Sleep Medicine, Brigham and Women’s Hospital, Boston, MA 02115, USA.
6. Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria.