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Consciousness and Its Variations

Consciousness and Its Variations. Chapter 4. Think About It. Do you feel as though you get enough sleep? Why or why not? Do your sleep patterns differ from school days to weekends or from your summer pattern? How much would you like to sleep? Why do you think people sleep?.

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Consciousness and Its Variations

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  1. Consciousness and Its Variations Chapter 4

  2. Think About It • Do you feel as though you get enough sleep? • Why or why not? • Do your sleep patterns differ from school days to weekends or from your summer pattern? • How much would you like to sleep? • Why do you think people sleep?

  3. Consciousness and Sleep • Consciousness: personal awareness of mental activities, internal sensations and the external environment • Circadian Rhythm: cycle that is roughly 24 hours long; fluctuations in bio/psych processes • Melatonin • Pineal Gland

  4. How much sleep? • From birth onward – amount of sleep and amount of time in REM and NREM decrease

  5. Why do we sleep? • Biological need – disruptions in mood, mental ability, reaction time, perception, motor skills • REM and NREM Rebound • Restorative Theory: restore and rejuvenate body and mind • Adaptive/Evolutionary Theory: help promote survival and environmental adaptation

  6. Sleep Stages • Onset of sleep & hypnagogic hallucinations: odd but realistic sensations – crash, falling, floating, flashing colors, myoclonic jerks • 1 NREM: few minutes, transitional, disengage from surrounding world, mental imagery, easily awakened • 2 NREM: 15-20 minutes; slow down • 3 NREM: slow wave • 4 NREM: slow wave; vitals drop to lowest level, sleepwalking, parasomnias, oblivious/hard to wake – 15 minutes

  7. Sleep Stages

  8. REM Sleep • 25% of sleep is REM; 75% of sleep is NREM • 70 minutes then backwards (4,3,2,REM) • Rapid Eye Movement • Paradoxical Sleep: muscles are relaxed, but vitals/adrenaline very active • Almost all dreaming occurs here • 1st episode 5-15 mins., last episode 40 mins. • Stage 3 & 4 decrease and REM increases

  9. Sleep Disorders • Insomnia – inability to fall asleep, stay asleep or feel adequately rested by sleep • Sleep Apnea – person repeatedly stops breathing • Night Terrors – increased physiological arousal, intense fear, panic, hallucinations and no recall • Narcolepsy – excessive daytime sleepiness and brief lapses into sleep during the day

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