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Outline and evaluate restoration explanations of the functions of sleep.
(8 marks + 16 marks)

The restoration explanation to explain sleep proposed by Oswald (1980) suggests there are 2
functions; SWS to enable body repair, and REM to enable brain recovery.

During SWS, a growth hormone (GH) from the pituitary…

Page 2

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a day, whereas the dolphin can already sleep from birth and has no REM from birth.
This suggests a relationship between neural development and REM sleep.

Studies to investigate REM functions have tested the effects of partial sleep deprivation, known as
`REM rebound' which is the need for more sleep…




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