Upload
zohar
View
32
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Consciousness & Sleep. Today’s Goal: Define the levels of consciousness and the stages of the sleep cycle. Consciousness. Awareness of ourselves & environment Preconscious Nonconscious Unconscious Dual processing. Circadian Rhythm. - PowerPoint PPT Presentation
Citation preview
Consciousness & Sleep
Today’s Goal: Define the levels of consciousness and
the stages of the sleep cycle.
Consciousness• Awareness of ourselves &
environment• Preconscious • Nonconscious• Unconscious • Dual processing
Circadian Rhythm
• Biological clock – regular bodily rhythms of 24-hour cycle
• Suprachiasmatic nucleus (SCN) – regulates gland production of melatonin
Sleep Cycle/Stages• EEG – brain wave activity• Stages 1-4 = NREM sleep• REM sleep
• Electrooculograms – eye movement• Electromyograms – muscle tension
• Today’s Goal: Define the levels of consciousness and the stages of the sleep cycle.
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
• Awake & alert – Beta waves– Faster, irregular waves – 15-45 peaks per second
• Awake but relaxed – Alpha waves– Smooth, regular waves– 10 peaks per sec.
NREM Stage 1• Theta waves• ~10 min.• Transition from wakefulness
to sleep• Hypnagogic state – brief
dreamlike experience• Hypnic jerks (body shutting
down)
NREM Stage 2• Theta waves• Sleep spindles – brief bursts in wave
frequency• K Complexes – brief bursts in wave
amplitude
Stages 3 & 4• Delta waves~30-40 min. of cycle• Blood pressure drops• Slowed breathing• Tissue growth, repairs• Growth hormone
REM Sleep• Paradoxical sleep• Brain is active but
body is immobile• Vivid dreams• Cortisol drops• Helps immune
system
Sleep Cycle
Sleep Cycle