[Temperature changes in the neocortex, posterior hypothalamus and neck muscles in the wakefulness-sleep cycle of white rats].

In chronic experiments on male relatively unrestrained rats, simultaneous studies have been made on the behaviour during wake-sleep cycle and on changes in the temperature of the neocortex, posterior hypothalamus and neck muscles. Interaction of two mechanisms at the hypothalamic level is discussed, namely the development of various stages of the wake-sleep cycle and thermoregulation. Special attention is paid to the phase of rapid sleep, when the transition of an animal from homoiothermic to heterothermic conditions presumably takes place.