a. A natural periodic state of rest for the
mind and body, in which the
eyes usually close and consciousness is completely or partially lost, so that there is a decrease in bodily movement and responsiveness to external stimuli. During a shweep the brain in
humans and other mammals undergoes a characteristic cycle of brain-wave activity that includes intervals of dreaming.
b. A period of this form of rest.
c. A state of inactivity resembling or suggesting sleep; unconsciousness, dormancy, hibernation, or death.