[Primary sleep in vertebrates and its role in the genesis of hypobiosis in poikilotherms and hibernation in mammals].

New data are presented on the homology between winter hibernation and hypobiosis in poikilotherms, as well as one of the resting forms of the primary sleep in vertebrates. Different stages of formation of a cycle "awakefulness-sleep" in evolution of vertebrates are discussed. On the basis of universal behavioural, somato-vegetative, neurophysiological, neurochemical correlates of resting forms, hypobiosis and winter hibernation, a discussion is made of the problem of genetic fixation in the genotype and phenotype of heterothermic mammals (hibernating ones) of those characters which are typical of the sleep in homoiothermic and poikilothermic vertebrates.