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Unformatted text preview: Consciousness Altered States of Consciousness Stages of sleep Sleep disorders Dreams Daydreams Hypnosis Meditation Alcohol Psycho-active drugs Near death experience Why do we sleep?? Rhythm of sleep Our bodies are in sync w/24-hr cycle of day & night through a biological clock Circadian rhythm Sleep Cycle Every 90 minutes Stage 4 very briefREM gets longer Sleep Stages Stage 0 = eyes closed, awake but alert Stage 1 = breathing slows, light sleep, Stage 2 = relax more deeply, easily awoken (~20min) Stage 3 = transition to deeper sleep Stage 4 = deep sleep (~30min) Stage 1 Experience fantastic images like hallucinations, sensation of falling body jerks suddenly EEG = relatively slow alpha waves Stage 2 brain waves slow further & show irregular waves Lasts ~ 2 minutes Stage 3 A transitional phase to the deep sleep of stage 4 Stage 4 Deep sleep Large delta waves (~30 min) Hard to awaken sleep talk, sleep walk, wet the bed Then go back through stages 2 & 3 REM sleep Very rapid brain waves (as if awake) Heart rate rises; breathing increases Sexually aroused Eyes dart back & forth rapidly behind lids Begin to dream REM sleep (contd) **Paradox** **Internally aroused---Externally calm** Sleep Deprivation Feel fatigued; effects well-being Impaired creativity, concentration Decreased immune system Irritability Slight hand tremors You need sleep!!! Restores body tissues Enhances growth process Sleep Disorders Insomnia = a sleep disorder involving recurring problems in falling or staying asleep cure = relax & drink milk before bed Sleep Disorders...
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- Spring '08