Evaluate evidence suggesting three possible functions of sleep

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Evaluate evidence suggesting three possible functions of sleep.

As a state of mind sleep involves the complete inactivity of the nervous system and a temporary suspension of consciousness. Despite sleep putting human bodies in a dormant state, it can have several adaptive qualities such as its ability to maintain and enhance memory and cognition. As part of its functions sleep can also help to maintain good mental health. During a typical sleep cycle, the brain will go through stages of REM and non-REM (NREM) periodically and within NREM, the brain exhibits slow electroencephalographic waves (delta waves).  It is believed that NREM is the sleep phase in which the majority of mental development and maintenance occurs.  Research has shown support for this in studies where it was found that declarative and non-procedural memory was improved after short periods of slow wave sleep when compared with control participants who were subjected to mild sleep deprivation.   (Tucker et al, 2006)

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One function of sleep identified through research findings is the maintenance of mental health.  Sleep deprivation can cause an increase in the likelihood depressive symptoms or disorders such as anxiety in an individual. This assertion is supported by longitudinal research conducted on the relationship between sleep and depression in adolescents. Participants were diagnosed with major depressive symptoms and subsequently reassessed approximately 7 years later. The results suggested that reduced REM latency was linked to the development of bipolar disorder in depressed individuals and the development of depression in control individuals with no previous signs of depression. (More stage 1 ...

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