PSY 202 Chapter 5: Sleep
PSY 202 Chapter 5: Sleep PSY 202
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This 3 page Class Notes was uploaded by Marissa Statner on Tuesday February 2, 2016. The Class Notes belongs to PSY 202 at California Polytechnic State University San Luis Obispo taught by Dr. Rujin, Dr. Laver in Fall 2016. Since its upload, it has received 30 views. For similar materials see General Psychology in Psychlogy at California Polytechnic State University San Luis Obispo.
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Date Created: 02/02/16
Chapter 5: Sleep I. A Bedtime Story • is there an excuse for falling asleep on the job? II. Biological Clocks • plants keep identical rhythm in nature and isolation A. Carcadian: once a day ◦ sleep/wake cycle ◦ body temp ◦ independent measures of time ◦ have their own daily cycles ◦ can be adapted to a 24 hour schedule when exposed to cues-Zeitgebers ◦ free running: without cues, organism reverts to its own internal cycle B. Infradian: less than once a day ◦ menstrual cycle ◦ hibernation C. Ultradian: more than once a day ◦ heartbeat ◦ breathing III. Free Running A. Absence of zeitgebers • plants: 22 hrs • monkeys: 24.5 hrs • mice: 23 hrs • humans: 25 hrs B. Suprachiasmatic Nucleus: above, crossing, kernel/spot • in hypothalamus • monitors melatonin C. Laboratory Studies • Weitzman & Czeisler (mid 1970s) ▪ isolated, unused hospital wing ▪ participants had to be psychologically stable 1 frequent, regular physiological measurements 2twenty 24 hr days to start, then no routine ▪ most participants began free-running 1bedtime drifted one hour later each day IV. Why is Monday morning so awful? • Weekday nights: 11PM-7AM • Friday night: to bed @ 1AM • Saturday night: to bed @ 3AM • Sunday night: to bed @ 11PM • Keep sleep schedule regular V. Stages of Sleep A. Falling asleep • sudden, not gradual (Dement 1974( B. Stage 1 • lasts about 10 min • drifting thoughts • slow rolling of eyes C. Stage 2 • lasts about 20 min • more synchronization • EGG responses to noise D. Stage 3-4 • about an hour • extreme synchronization • night terrors/somnambulism • dreaming E. Rapid Eye Movement (REM) sleep • 30 min-1 hr • rapid eye movements • desynchronization • increased blood flow to brain • paralysis- loss of muscle tone • arousal of sex organs ◦ dreaming F. Changes in Cycling • through the night ◦more sleep—>more REM • through life ◦ older—>less REM VI. Theories of Dreaming A. Psychoanalytic (Sigmund Freud) • wish fulfillment/desire gratification • manifest vs. latent content • dreams reflect thoughts B. Activation: synthesis (Hobson & McCarley) • random signals emanate from pons • these are interpreted by cortex C. Information Processing (Evans; Crick; Cartwright) • mental “housekeeping”/memory consolidation • problem solving & insight D. Summary • NREM dreams are involved in the simple retention of new info • REM dreams are critical in applying info in new or creative ways VII. Sleep Deprivation & Sleep Debt • Randy Gadner, 1964: record for staying awake 264 hours (11 days) A. Symptoms of sleep deprivation • impaired cognition • hallucinations • paranoia • auto behavior • microsleep episodes • REM rebound B. Sleep debt • accumulated