Sleep Occurs in Four Stages
During the sleep, homeostasis will fluctuate because sleep occurs on four stages (Davidmann 1998). The individual goes from awake to Stage 1, then to 2, 3 and finally 4. After spending about twenty minutes in Stage 4, individuals return to Stage 1 and progress back to Stage 4. The individual will continue to make these cycles throughout their sleep. Most individuals will experience about 4 to 5 cycles a night (Davidmann, 1998). During Stage 1 the individual will experience what has been named REM (Rapid Eye Movement). During REM the body will show more signs of consciousness by spontaneous muscle contractions, flagellate excretion, and oculomotor coordination (eye movement). The body will experience these tensions and reactions because this is the active time of sleep in the average human (Davidmann, 1998). REM is the time in which the individual will have their dreams. Nathaniel Kleitman discovered it in 1953. It always occurs in the lightest stage of sleep, Stage 1. It has been given its name because of the muscle contractions in the eye motor receptors. These electrical impulses originate from the brain stem and then travel to the eyes to produce imagery. The catalysts for these impul
It takes even more arousal than Stage 2 sleep to awaken a person from this stage of sleep. People who experience exaggerated REM will suffer from fatigue and sleep depravation while they are awake. "How the Human Brain Developed and How the Human Mind Works". The reason the dreams occur in the REM or the lightest stage is because this is the only stage in which the conscious mind can interpret the imagery of the subconscious. When a person is dreaming you can visually tell by the movement of the eyes. The interesting factor is that each time the sleeper enters the REM phase of sleep the REM phase will increase in length. There are no visible eye movements in this stage (Carskadon 10). Most of the dreams remembered occur during Stage 3 sleep (Carskadon 11-12)-Stage 4 sleep is the deepest of sleep. Images appear in the form of wandering or dream like thought, which can be controlled unlike a full dream state. A newborn child"tms sleep can consist of as high as 50 REM type sleep (Davidmann, 1998).