effects of sleep deprivation

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  • Created by: Molly
  • Created on: 27-11-12 18:31
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  • functions of sleep- restoration theories
    • REM in maintaining and restoring brain function
      • oswarld (1969)
        • predicted burning up more resources during the day would lead to longer sleep times.
      • newborn babies spend a third of every day in REM sleep.
      • a time  of massive brain growth, development of synaptic connections between neurons.
      • SHAPIRO et al (1981) found that runners slept longer and spent more time in NREM after running a marathon ( supports Oswald)
        • however, horne and minard found that exahausting exercise leads to people going to sleep faster but not sleeping longer than normal
      • effects of sleep deprivation
        • peter tripp stayed awake for 201 hours : mental disturbance, hallucinations,  paranoid delusions.
          • TSD can have effects on mental functioning.
        • 1964 Randy gardner 264 hours, blurred vision, speech effected, paranoid.
          • people can endure long periods of TSD with no long term effects.
          • only a small proportion of sleep lost is recovered
          • recovery is concentrated on the deep stages of NREM and REM
      • evaluation
        • research used is case studies, no control, they only provide clues to the effects of TSD
        • studies in non human animals have shown that prolonged sleep deprivation can lead to death.
    • Hornes restoration theory
      • sleep deprived participants given cognitive tasks can maintain reasonable performance by putting more effort in, eventually deprivation produces effects on memory and attention
      • moderate sleep deprivation appears to have few effects on the body
      • when allowed to sleep p's make up far more REM and deep NREM sleep that they have lost than the lighter stages of NREM
      • proposed REM and NREM are essential for normal brain function
      • light NREM sleep appears to have no obvious function
      • horne suggests that body restoration could take place in periods of relaxed wakefulness during the day when energy is low.

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