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Ecological Theory of Sleep
AO1 sleep is an adaptive mechanism for survival, and that an animal's sleep pattern will depend
on the ecological niche it inhabits. One account of this theory is Meddis, whom suggested that sleep
was a form of protection, avoiding predators by staying still when they have nothing better to be
doing with their time, eg: finding food in the dark.
AO2 Meddis' account of the evolutionary theory of sleep has issues regarding this belief, such as
the sleep pattern of dolphins.…read more

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Restoration Theory of Sleep
AO1 The restoration theory of the function of sleep suggests that sleep is to allow replenishment
of the body's biochemical and physiological processes that progressively degrade during the day.
One account of the function of sleep is Oswald's strand, whereby he suggests that being awake
disrupts homeostasis, and that the purpose of REM is to help the brain recover, hence they high
levels of brain activity, and SWS is to help the body repair, by increased secretion of growth
hormones.…read more

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Stress causes cortisol
secretion, ad plenty of research has shown that cortisol secretion over a long period of time can have
harmful effects. So perhaps the stressful mechanism used to prevent the rats from sleeping can
account for these negative effects, rather than sleep deprivation.
AO2 Also, a key issue raised by this experiment in the use of rats.…read more


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