L.V. Poskotinova - Dr.Sc. (Biol.), Ph.D. (Med.), Associate Professor, Head of Biorhythmology, The Institute of Environmental Physiology, Ural Branch, Russian Academy of Sciences (Arkhangelsk). E-mail: liliya200572@mail.ru E.V. Krivonogova - Ph.D. (Biol.), Senior Research Scientist, The Institute of Environmental Physiology, Ural Branch, Russian Academy of Sciences (Arkhangelsk). E-mail: elena200280@mail.ru N.M. Khasanova - Ph.D. (Med.), Neurologist, Northern State Medical University, Arkhangelsk Regional Clinical Hospital (Arkhangelsk). E-mail: khasanovanina@rambler.ru M.N. Krasnikova - Neurologist, Arkhangelsk Regional Clinical Hospital (Arkhangelsk). E-mail: kmn.murm@gmail.com