The evolutionary explanations of sleep

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

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

3. AO1: Sleep is a period of inactivity which is important for warm blooded animals who use lots of energy maintaining body temperature and for small mammals with a high metabolic rate.This refers to which evolutionary explanation?

  • Energy conservation
  • Foraging requirements
  • Predator avoidance
  • Waste of Time

4. 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
  • predator avoidance
  • waste of time
  • energy conservation

5. AO1: Sleep ensures animals stay still when they have nothing else to do. Sleeping more is the best way to pass on genes due to it being safer to be asleep.This refers to which evolutionary explanation?

  • Waste of Time
  • Energy Conservation
  • Foraging Requirements
  • Predator Avoidance

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