The evolutionary explanations of sleep

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1. AO2: general support for the evolutionary approach comes from who that found mammals with similar genes have similar sleep patterns

  • Meddis (1975)
  • Capellini (2008)
  • Siegel (2008)
  • Horne (1998)
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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?

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

3. 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.

4. AO2: Zepellin an Rechtstaffen (1974) found that small animals with a higher metabolic rate sleep more than large animals. This supports?

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

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?

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

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