1. Laboratory of Sleep/Wake Neurobiology, Institute of Higher Nervous Activity and Neurophysiology of the Russian Academy of Sciences 1 , 117865 Moscow, Russia
2. Center for Coordination of Fundamental Scientific Activities, National Medical Research Center for Therapy and Preventive Medicine 2 , 101990 Moscow, Russia
3. Institute of Physics, Saratov State University 3 , 410012 Saratov, Russia
4. Institute of Cardiological Research, Saratov State Medical University 4 , 410005 Saratov, Russia