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Marco Ball-Albarran

Outline and evaluate one or more evolutionary explanations for the functions of
(8 marks + 16 marks)

Evolutionary explanations of sleep have an adaptive purpose to maximise the chances of survival and
pass on the genes to offspring.
One of the main features of the evolutionary explanation…

Page 2

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Marco Ball-Albarran

sleep. The fact that unilateral sleep has separately evolved in both of these different animals shows
it is a means of solving the evolutionary pressures facing these animals.

There is a further argument for the REM/NREM distinction because not animals have REM. Animals
which are more primitive, such…


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