Restoration theories

People generally sleep because they are tired, suggesting that sleep is fundamentally fro rejuvenation and repair. Growth hormone is released during sleep, stimulating tissue growth and aiding proten synthesis, used to repair damaged tissues. Waste products are also removed.
Oswald's (1980) restoration theory. This explaination sees sleep as helping to reserve and/or restore biochemical and/or physioloical processes that are progresssively degraded during the day. In essence it suggests that being awake disrupts the homeostasis of the boy and that sleep is required to resotre it. High levels of brain activity during REM sleep indicate brain restoration, while growth hormone production during the four stages of SWS indicate bodily resotration and repair.
Horne's (1988) core sleep model; as many resotration processes, such as digestion actually occur while awake, with some occuring more during wakefulness than when sleeping - Horne concluded that sleep does not provide any repair functions in humans , except for the brain. Horne referred to core sleep , which he believed is essential for restoration, whereas other types of sleep he called optional sleep, whose main purpose is energy conservation. stage 4 and REM sleep are seen as necessary for the healthy brain functioning required for cognitive processing; during these stages the brainis seen as refreshing and resotring itself, ready for the challenges of the new day.
Adam (1980) reported that many restorative processes, like digestion, do occur during sleep, supporting the restoration explaination.
Cirelli et al (2004) found that during SWS, genes associated with the protein production regulating synaptic connections are activated, supporting restoration theories especially Oswalds.
Shapiro et al. (1981) found that long distance runners tend to sleep for longer than normal suggesting that sleep does aid restoration.

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Restoration theories

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	Created by harry_bygraves almost 11 years ago