An inactive state resembling deep sleep in which certain animals living in cold climates pass the winter. In hibernation, the body temperature is lowered and breathing and heart rates slow down. Hibernation protects the animal from cold and reduces the need for food during the season when food is scarce. Compare estivation.
Does Dreaming Indicate a Good Nightâs Sleep? Dreams are typically indicative of a good nightâs sleep, demonstrating that you have passed through the light sleeping phase (NREM) and entered into a deep sleep (REM).
Although reports of dreaming are most frequent and vivid when an individual is aroused from REM sleep, dreams do occur at sleep onset and during NREM sleep as well. 23 During an average nightâs sleep, about two hours are spent dreaming, mostly during REM sleep.