The evolutionary explanations of sleep

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1. AO1: Predators can sleep more whilst prey have to sleep less. This refers to which evolutionary explanation?

  • Waste of time
  • Predator Avoidance
  • Energy Conservation
  • Foraging Requirements
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2. AO2: Capellini (2008) looked at previous studies with standardised procedures and found that smaller animals with higher metabolic rates sleep less. This could be due to?

  • wanting to conserve energy
  • Foraging requirements
  • wanting to waste time
  • wanting to avoid predators

3. AO2: energy levels only drop in NREM sleep, not in REM sleep. This discredits which explanation?

  • the energy conservation explanation
  • the foraging requirements explanation
  • the waste of time explanation
  • the predator avoidance explanation

4. AO2: An alternative approach by Horne (1998) combines the evolutionary and restorative explanations. It suggests:

  • There is a core and optional sleep: the core sleep is mainly SWS and is vital for processes to work and optional sleep is mainly REM and is dispensable.
  • There is a core and optional sleep: the core sleep is mainly REM and is vital for processes to work and optional sleep is mainly SWS and is dispensable.

5. AO2: Capellini (2008) looked at previous studies with standardised procedures and found that animals who sleep in exposed positions sleep less. This supports which explanation?

  • foraging requirements
  • energy conservation
  • predator avoidance
  • waste of time

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