Sleep cycle

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Author:
gracebee101
ID:
232354
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Sleep cycle
Updated:
2013-09-15 22:45:26
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Psychology
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first learnt stuff
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  1. Circadian Rhythms (7)
    • body has more than 100
    • each unique 24 hour cycle influences an apect of body's function inc: 
    • temperature
    • hormone levels
    • heart rate
    • blood pressue
    • pain threshold
  2. Suprachiasmatic (2)
    • regulates the firing of nerve cells that seem to set your circadian rhythms 
    • called internal pace-maker
  3. Zeitgebers
    outside influences that influence 24 hour schedule
  4. Temperature cycle (3)
    • lowest temp when inactive
    • temp flows at circadian rhythm
    • afternoon temp can be 3 degrees higher than morning temp
  5. Sleep-wake cycle (3)
    • sleep patterns follow circadian rhythm
    • sleep better when temp is lowest (early am) most likely wake when temp rises (6-8am)
    • when elderly suprachiasmatic (internal pace-maker) losses cells, which changed circadian rhythms (noticeable in eldery's sleeping patterns)
  6. The sleep cycle (3)
    • has 5 stages
    • each cycle lasts 90 mins, good sleep 4-6 cycles
    • first time through cycle spend 10 mins in REM sleep, increases to 30-60 mins by last cycle
  7. Stage 1 sleep (4)
    • brain waves go from beta to alha to theta
    • hypnotic jerks
    • lasts 10 mins
    • transition from relaxed wakefulness too sleep
  8. Stage 2 sleep (4)
    • Sleep spindles - bursts of rapid rhythmic brain wave activity
    • body temperature starts to reduce, heart rate begins to slow
    • lasts 20 mins
    • compared to stages 3 and 4, stage 2 is still light sleep
  9. Stage 3 and 4 sleep (6)
    • Deep sleep (stage 4 more intense)
    • Delta waves - deep, slow brain waves
    • body repairs and regenerates tissues, builds bone and muscle and appears to strengthen immune system
    • when woken from deep sleep feel disorientated and drowsy
    • Stage 4 is Deepest stage of sleep
    • less time in stages 3 and 4 as night progresses
  10. Stage 5 sleep (7)
    • Rapid Eye Movement
    • after reverting back through stages 3 and 2, the brain enters REM sleep
    • paradoxial sleep - brain activity increases, but muscles become more relaxed
    • Marked by more vivid, detailed and story-like dreams (dream in all stages but these more vivd
    • called PARADOXICAL SLEEP
    • REM periods lengthen and occur closer together as night progresses
    • later period may last an hour - early only few mins
  11. The pineal gland (2)
    • controls circadian sleep-waking cycle
    • located near the hypothalamus at the centre of the brain
  12. Melatonin (3)
    • amount present in bloodstream influences how sleepy a person becomes
    • higher levels = more sleepy
    • secreted amounts varies according to amount of light
  13. Nrem sleep (3)
    • 80% of all sleep is nrem sleep
    • brain is active, but not as active as in rem sleep
    • contains stages 1 to 4
  14. Determining Sleep Stages (3)
    • Each stage is dominated by a particular identifiable brain wave of rhythm
    • frequency = number of brain waves
    • amplitude = intensity of brain waves
  15. Physical side of Stage 1 (8)
    • lose awareness of self and surroundings
    • lower level of bodily arousal 
    • decrease in:
    • HR
    • respiration
    • body temp
    • muscle tension
    • hypnotic jerking
    • alpha brain waves turn to theta waves (mixture of high and low amplitude)
  16. Physical side of Stage 2 (8)
    • body movements lessen 
    • breathing regulates
    • blood pressure keeps falling
    • temperature keeps falling
    • HR is slower
    • brain waves are theta waves (slightly lower in frequency and higher in amplitude than those of Stage 1)
    • brief bursts of higher frequency brain wave activity called sleep spindles - indicate really asleep
    • brain still responds to external stimuli
  17. Physical side of Stage 3 (9)
    • Keep dropping:
    • HR
    • blood pressure
    • body temperature
    • breathing keeps slowing and steadying
    • person becomes less responsive
    • people difficult to wake
    • reduction in brains electrical activity
    • delta brain waves (slow, large, regular) - lower in frequency and higher in amplitude
    • delta waves signify Slow Wave Sleep (SWS)
  18. Physical side of Stage 4 (4)
    • physiological signs similar to stage 3
    • muscles are completely relaxed
    • person very difficult to wake
    • Sleepwalking, talking, night terrors and bedwetting happen in these stages
  19. Physical side of REM sleep (6)
    • Beta brain waves - irregular, low amplitude and high frequency 
    • body's internal functioning is more active
    • HR = regular and faster
    • breathing = quicker
    • blood pressure rises
    • muscles limp - occasional twitches

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