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Unformatted text preview: Test 2: Ch. 5-10 Ch. 5- Sleep Circadian Rhythm- cyclical changes that occur on a roughly 24-hour basis in many biological processes-hormone release, brain waves, body temperature, and drowsinesssleepiness and drowsiness 5 Stages of Sleep: Awake-Beta waves-producing waves 13 or more times per second Calm wakefulness-Alpha waves-8-12 times per second Stage 1-Theta waves-4-7 times per second Stage 2-Sleep spindles (12-14 cycles/sec) and K complexes (sharply rising and falling waves) Stage 3&4-Delta waves-slow 1 or 2 cycles a second REM sleep-wake like high-frequency, low amplitude waves Stage 1- light stage of sleep that lasts 5-10 minutes and our brain activity powers down by 50% Hypnagogic imagery-scrambled, bizarre and dreamlike images that flit in and out of consciousness Hypnic myoclonia-sudden muscle contractions Stage 2- brain waves slow down even more-slower heart rate, body temp. decreases, muscles relax and eye movement ceases-65% of sleep Stage 3&4- after 10-30 minutesdeeper slow-wave sleep-in order to feel fully rested must experience this sleep throughout the night Stage 5: Paradoxical or REM sleep-bodies are paralyzed otherwise wed act out our dreams REM sleep- stage of sleep during which the brain is most active and during which vivid dreaming most often occurs-spend as much as an hour in REM sleep Pass through these 5 stages every night and lasts about 90 minutes REM rebound: when humans are deprived of REM for a few nights-amount and intensity of REM sleep increase-much more intense dreams, sometimes nightmares-powerful bounce-back of REM sleep Middle ear muscle activity- muscles of our middle ears become active, almost as though theyre assisting us to hear the sounds in the dream REM behavior disorder- act out their dreams EEG- measure brain waves-distinguishes among the major stages of sleep and two levels of wakefulness Restoration theory- body wears out during the day and sleep helps restore Preservation/protection theory- sleep evolved to preserve energy during periods when potential activity is low Insomnia- difficulty in falling asleep-most common sleep disorder-waking too early in the morning-waking up during the night and having trouble returning to sleep Restless legs syndrome- urge to move our legs or other body parts, often while attempting to sleep Narcolepsy- disorder characterized by the rapid and often unexpected onset of sleep Cataplexy- complete loss of muscle tone Sleep apnea- disorder caused by a blockage of the airway during sleep, resulting in daytime fatigue-hard to breathe Night terrors- sudden waking episodes characterized by screaming, perspiring, and confusion follow by a return to a deep sleep (non-REM sleep) Sleepwalking- walking while fully asleep-rarely remember their actions Sleep deprivation- hallucinate, depression, mood swings, paranoia, psychotic Peter Tripp-his sleep deprivation changed him forever and after he had a changed personality-moody and depressed...
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This note was uploaded on 02/20/2011 for the course PSYCH 111 taught by Professor Schreier during the Fall '08 term at University of Michigan.
- Fall '08