Ch4 Consciousness - Consciousness: Wide Awake, in a Daze,...

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Consciousness: Wide Awake, in a Daze, or Dreaming? “Normal” Consciousness and Altered States of Consciousness
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What Is Consciousness? Feelings, thoughts, and aroused states in which we are aware Levels of consciousness exist.
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Sleep, Dreaming and Circadian Rhythm Why do we sleep? What happens when we sleep? Purposes of dreams Sleep disorders
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Functions of Sleep: Why Do We Sleep and What If We Don’t Sleep always wins – we MUST sleep Why? Sleep is Restorative Sleep enhances Immune Function Sleep Keeps the Brain Alert Resensitization of NE receptors Sleep Helps Us Process Memories Sleep Enhances Mood
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How Much Sleep Do We Need? Depends on several factors Age Older we get, the less sleep we need Lifestyle Stressors, responsibilities, environment Genetics People may be genetically predisposed to be “early birds” or “night owls” 47 % of adults in U.S. are sleep-deprived!
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Circadian Rhythm and the Biological Clock Natural rhythm of sleeping and waking Programmed by suprachiasmatic nucleus (SCN) in the hypothalamus SCN directs the release of the neurohormone melatonin Facilitates the onset of Sleep
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“Weekend Lag” and Jet Lag Created by dramatic alterations in sleep patterns Disrupts circadian rhythms, making us irritable, tired, less attentive and moody (AKA jet lag) How to counteract jet lag Start adjusting sleep schedule before departure Adapt to new time zone when you arrive Consider taking melatonin pills
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Working the Night Shift The constant shift in schedules causes disruption in circadian rhythm Can impair thinking and health
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Stages of Sleep: What the Research Tells Us There are five stages of sleep According to most traditional formulations Electroencephalographs (EEGs) are used to record electrical activity of brain during sleep Beta waves – rapid, high number of cycles per second; alert and awake Alpha – slower and less frequent; relaxed non-Rem sleep – no rapid eye movement REM sleep – rapid eye movement
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Non-REM Sleep Stage I Light sleep, theta waves Stage II Clearly asleep, sleep spindles
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Non-REM Sleep (Cont’d) Stage III Transitional stage, delta waves Stage IV Deep sleep, body maintenance and restoration
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REM Sleep: Dream On Active stage – breathing increases, heart beats irregularly Brain waves look awake, but not! Dreaming during REM
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Ch4 Consciousness - Consciousness: Wide Awake, in a Daze,...

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