NREM sleep is divided into four stages : stage 1- very well-to-do sleep wherein the person feels drowsy and relaxed , stage 2- light sleep that will last only from ten to fifteen proceeding , stage 3- domination of parasympathetic nervous systems that slows down the midpoint and respiratory rates as well as other body processes and sometimes snoring whitethorn occur and the 4th stage will be the deep sleep is sight to restore the body physically , dreams and rolling of the eyes may occur in this stage . Another type of sleep is the REM sleep or the rapid eye work sleep that constitutes 25 of sleep of a young fully-grown and usually recurs every ninety minutes and lasts five to cardinal minutes . On the other hand , dreams in REM sleep were usually remembered because it is consolidated in the memory (pp 953-954 . There are many factors that may affect sleep of an single quality of sleep and quantity of sleep were both change by a number of factors . The quality of sleep is the strength of an individual to stay asleep and to get the required measuring of REM and NREM sleep while the quantity of sleep is the environment fatigue , life style , psychological stresses are just some of the factors that indeed affects the sleep of an individual (p . 956Literature ReviewIn an cyberspace article , they listed six persons that have a contribution in sleep research . A French Scientist Henri Pieron authored a disc entitled Le probleme physiologique...If you want to get a full essay, order it on our website: Ordercustompaper.com
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