This stage has been described as an “Active brain in a paralyzed body”, and the dreaming sleep stage occurs during REM sleep.A sleeper’s brain races as the eyes dart back and forth rapidly behind closed lids.Lack of sleep is directly linked to poor health, and it increases the risk of diabetes, heart diseases, obesity, and personality disorders. In the 1970s, the location of this internal clock was found to be the Supra Chiasmatic Nucleus(.Sleep deprivation played a role in catastrophes such as the Exxon Valdez oil spill off the coast of Alaska, the space shuttle Challenger disaster, and the nuclear accident at the Three Mile Island. National Library of Medicine and National Institutes of Health indicate that there are more than 100 different types of sleep and waking disorders, it is a group of syndromes characterized by disturbance in a person’s hours of sleep, their quality or timing of sleep, or in behaviors or physiological conditions associated with sleep. Marc Halpern defines it as “Sleep disorders are conditions in which a person’s sleep pattern is disturbed, such that a person has a hard time falling asleep, staying asleep, sleeps too much, or sleeps at inappropriate times” . Although it is largely self-regulating, the clock responses to several types of external clues to keep it set twenty-four hours, and scientists call these cues Zeitgebers – a German word meaning “time givers” – it includes, Light, Time Cues, and Melatonin.Scientist divide sleep into two major types: figure A – different stages of sleep: Stage 1: Also called Alpha brainwave pattern sleep.
Dreaming sleep stage: Scientists don’t really know if dreams have deep meaning, but just as a deep sleep stage restores our body, dreaming sleep stage restores our mind in part by clearing out the irrelevant information.
Homeostasis influences many of the body functions, and sleep is one of them.
It influences the timing of sleep in two different aspects.
Three to five times a night, or about every ninety minutes, a sleeper enters REM sleep, and the REM duration progressively increases over the duration of the night, and generally the final period of REM may last about thirty minutes.
All in all the REM sleep make up about 25 percent of total sleep in young adults, and if someone was deprived of REM sleep, the person enters the REM sleep earlier and spends a higher proportion of sleep time in it, and that phenomenon is called REM rebound. : Our body has a built-in tendency to maintain internal equilibrium by adjusting our physiological process, and one of the critical concepts known is Homeostasis.
Unless the sleeper has circulatory or other physical issues, the body temperature arise, and the penis or clitoris becomes erect, blood pressure increases, heart rate and breathing speed up to daytime levels.