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Restorative Theory Sleep

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Submitted By Aimeemcdonald
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Outline and evaluate the restorative theory as explanation of a function of sleep

The restorative theory is suggested to be a purpose of sleep that serves the function of restoring the body in several ways; firstly Slow Wave Sleep (SWS) is said to be the stage of sleep that releases the growth hormone. This hormone is functional for renewing proteins and involved in protein synthesis, and also involved in the immune system in restoring antibodies. This idea is supported by Sassin et al who looked at individuals who "reversed" their sleep cycle, so they were asleep during the day and awake at night, and the growth hormone was still released during sleep, supporting the role of the SWS and release of neurotransmitter, and showing the importance of sleep as a restorative function.

Another aspect of the restorative theory as an explanation of sleep, is the idea that brain development takes place during the Rapid Eye Movement (REM) stage, which is why babies have longer REM sleep, as they are processing information such as memories, as well as secreting growth hormone etc. This view is a biological view, and contrasts with the evolutionary theory of sleep which suggests babies have longer REM sleep as an adaptive response for parents to be able to work, hunt etc. However, it has been found that length of REM sleep is directly proportional to the immaturity of the species, for example dolphins have no REM sleep and can swim from birth, compared to the platypus, which is immature at birth and has 8 hours REM sleep. Another restorative function of sleep is the idea that during REM sleep you are processing memory. It has been suggested by Crick and Mitchison that unwanted memories are discarded and wanted memories are made more accessible; but a more complex link that this has been found, suggesting slow wave Sleep (SWS) is needed for semantic and episodic

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