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Biological Rhythms & Sleep

Biological Rhythms
Research studies into Circadian, Ultradian &
Infradian rhythms, including the role of
endogenous pacemakers and exogenous
The consequences of disrupting biological rhythms
(for example shift work, jet lag)
Sleep States
The nature of sleep
Functions of sleep, including evolutionary
explanations & restoration theory…

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The Nature of Sleep

Sleep is found upon all animals in the animal kingdom and therefore must perform some critical

Evolutionary Explanation of Sleep:

According to this theory the function of sleep is similar to hibernation, and that it is to conserve
energy when the environment is hostile. Therefore…

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Many restorative processes like protein synthesis & digestion do occur during sleep but they also
occur during the day too. So Horne concluded that there are only repairs in the brain during sleep.
Horne also said that there were 2 types of sleep: Core Sleep which is essential for brain…

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This idea is crucial in knowing how much sleep a person needs. Sleep varies by age, quantity &

Baby- Enters REM sleep immediately

5-12 ­ REM sleep is ¼ of their sleep, increase in NREM sleep

Adolescent- Early part of adolescence= Sleep Utopia (Wake up feeling refreshed) but as…

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Evaluation of Lifespan Changes in sleep:

Advantages Disadvantages
Objective measurements- This theory Methodological problems- To measure
has been tested and confirmed by many sleep a person must be connected up to
scientists. equipment in laboratory conditions, this
however change the quality of sleep and
so may alter the results.



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