Altered States of Consciousness 1.Sleep Deprivation 2.Sleep Disorders 3.Dreams.
Consciousness & Sleep
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Transcript of Consciousness & Sleep
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Consciousness & Sleep
Today’s Goal: Define the levels of consciousness and
the stages of the sleep cycle.
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Consciousness• Awareness of ourselves &
environment• Preconscious • Nonconscious• Unconscious • Dual processing
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Circadian Rhythm
• Biological clock – regular bodily rhythms of 24-hour cycle
• Suprachiasmatic nucleus (SCN) – regulates gland production of melatonin
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Sleep Cycle/Stages• EEG – brain wave activity• Stages 1-4 = NREM sleep• REM sleep
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• Electrooculograms – eye movement• Electromyograms – muscle tension
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• Today’s Goal: Define the levels of consciousness and the stages of the sleep cycle.
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NREM/REM Sleep• NREM (non-rapid-eye-movement)– 75% of sleep– Restores the body
• REM (rapid-eye-movement– 25% of sleep– Restores brain– Vivid dreams– Body immobile
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• Awake & alert – Beta waves– Faster, irregular waves – 15-45 peaks per second
• Awake but relaxed – Alpha waves– Smooth, regular waves– 10 peaks per sec.
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NREM Stage 1• Theta waves• ~10 min.• Transition from wakefulness
to sleep• Hypnagogic state – brief
dreamlike experience• Hypnic jerks (body shutting
down)
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NREM Stage 2• Theta waves• Sleep spindles – brief bursts in wave
frequency• K Complexes – brief bursts in wave
amplitude
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Stages 3 & 4• Delta waves~30-40 min. of cycle• Blood pressure drops• Slowed breathing• Tissue growth, repairs• Growth hormone
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REM Sleep• Paradoxical sleep• Brain is active but
body is immobile• Vivid dreams• Cortisol drops• Helps immune
system
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Sleep Cycle
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Sleep Cycle
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