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Introduction to Sleep (REM (eyes back in forward facing position (eyes…

- - - - specific postures
      - inactivity
      - reduced responisiveness
      - closed eyes
      - is rapidly reversible
      - behavioural preludes (eg dog walking in circles)
- - - - active, eyes open wakefulness
        
        Beta activity (13-30Hz), Low amp, high frequency waveforms
      - eyes closed wakefulness
        
        Alpha activity (8-12hz)
      - Sleep
        
        synchrony develops, high amplitude, low frequency waveforms
- - - - as they grow more frequent--> stage 2 sleep
  - - - high amp and low freq waves (excess of 75mV)
      - due to high level of synchrony
      - K complexes merging
    - - muscle tone drops
      - wake up during this stage will feel groggy
- - - - regulatory processes are activated to ensure appropriate amounts of sleep occur
      - if sleep is disturbed there are negative consequnces
        
        tiredness etc
        
        will over sleep to compensate (rebound sleep)
      - homeostatic process in slow wave sleep patterns
        
        more SWS reduces need for further sleep
        
        if sleep deprived, sleep will include more SWS and more cycles
      - increases exponentially during wakefullness and decrease during sleep
    - - one cycle lasts about a day
      - light is an external cue that sets rhythm
      - endogenous, suggesting presence of internal biological clock
      - potential longer than 24 hours but corrected for by external factors