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Chapter 6 - Sleep Dreams Sleep the irresistible tempter to...

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1 1 States of Consciousness Chapter 6 2 Sleep & Dreams Sleep – the irresistible tempter to whom we inevitably succumb. Mysteries about sleep and dreams have just started unraveling in sleep laboratories around the world. 3 Biological Rhythms and Sleep Circadian Rhythms occur on a 24-hour cycle and include sleep and wakefulness. Termed our “biological clock,” it can be altered by artificial light. Light triggers the suprachiasmatic nucleus to decrease (morning) melatonin from the pineal gland and increase (evening) it at night fall. 4
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2 5 Measuring sleep: About every 90 minutes, we pass through a cycle of five distinct sleep stages. Sleep Stages 6 Awake but Relaxed When an individual closes his eyes but remains awake, his brain activity slows down to a large amplitude and slow, regular alpha waves . A meditating person exhibits an alpha brain activity. 7 During early, light sleep (stages 1-2) the brain enters a high-amplitude, slow, regular wave form called theta waves . A person who is daydreaming shows theta activity. Sleep Stages 1-2 8 During deepest sleep (stages 3-4), brain activity slows down. There are large-amplitude, slow delta waves . Sleep Stages 3-4
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3 9 Stage 5: REM Sleep After reaching the deepest sleep stage (4), the sleep cycle starts moving backward towards stage 1. Although still asleep, the brain engages in low- amplitude, fast and regular beta waves much like awake-aroused state.
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