Sleep Outline - States of Consciousness Sleep Sleep is ACTIVE o Special form of mental activity RHYTHMIC o Occurs in repeating cycles INTERNAL o A

Sleep Outline - States of Consciousness Sleep Sleep is...

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States of Consciousness - Sleep Sleep is: ACTIVE o Special form of mental activity RHYTHMIC o Occurs in repeating cycles INTERNAL o A processing of internally generated stimuli o Sensory input & motor output is dampened o Tensor timpani (tightens ear drums) NECESSARY o Decreased performance, death if deprived Why do we sleep? We spend 1/3 of our lives sleeping If an individual remains awake for several days, immune functions and concentration deteriorates +Memory consolidation, growth hormones released, remove toxic wastes Without it we are fatigued, irritable, have decreases alertness, trouble focusing & concentrating, have more accidents, immune system depressed, gain weight, are at risk for depression, increase fat production, increase inflammation of joints, have reduced muscle strength and slower reaction time. Accidents: frequency of accidents increase with loss of sleep Sleep Deprivation 1. Impaired Concentration 2. Emotional irritability 3. Depressed Immune System 4. Gain weight 5. Fatigue and subsequent death
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Sleep Theories 1. Sleep restores and repairs the brain and body 2. Sleep builds and strengthens memories 3. Sleep facilitates creative problem solving 4. Sleep is the time when growth hormones are active 5. During sleep, CSF flow increases through brain tissue and washes out metabolic waste products Sleep Stages Measuring sleep: about every 90 minutes, we pass through a cycle of five distinct sleep stages 1,2,3,4,3,2,3,4,3,2,3,2,REM Stage 1 - Light sleep o (2 min) irregular EEG waves o Awakened easily; HR and breathing slows o Hypnagogic sensations (when you wake up feeling like you were falling) Stage 2 o
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