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Evolutionary Theory
of Sleep
AO1
Sleep must be adaptive as every an animal does it despite substantial costs, it must also be
advantageous and a vital bodily function.

Predator avoidance- sleep constrained by risk of predators. If an animal is a predator it can sleep for
longer as there is…

Page 2

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Waste of time- Meddis 1975 proposed the "waste time hypothesis" claiming that sleep helps
animals stay out of harm when they are most vulnerable. It also ensures that animals stay still when
they have nothing better to do and also find places to sleep where they are hidden therefore
reducing…

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