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Lecture 17

Lecture 17 november 12th.docx

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Department
Psychology
Course
Psychology 1000
Professor
Dr.Mike
Semester
Winter

Description
Lecture #17 – Tuesday, November 12, 2013 Topic: Dreaming  Theories of Sleep  Sleep Disorders  Dream Content Why do we sleep? What causes sleep disorders? What do we dream about? Dr. Hobson is looking at the EEG tracing from a patient in his sleep lab. The EEG is dominated  by delta waves. Most likely, this person is in: Stage 4 sleep. WHY DO WE SLEEP? (Some possibilities but no definite answer) a. Restorative Function (restore mental and bodily functioning) ­ However, if sleep deprived – attention lapse and irritability but can still function and  very little effect on task performance with exception of visual pursuit task ­ If restoration occurs, it occurs during first third of your sleep b. Evolutionary Benefit – survival aspect ­ Webb (1975)  c. Learning and Memory ­ REM deprived subjects show reduced ability to retain new information ­ Note: REM specific  d. Mood Adjustment ­ Berry and Webb (1985) – Speed of cycling into REM correlated with positive mood  on following day ­ People who went to REM the fastest feel the best the next day ­ Note: Depressed individuals tend to cycle into REM very quickly o Perhaps this helps improve mood in some fashion o Maybe depressed individuals try to self­treat themselves by entering REM  quickest SLEEP DISORDERS ­ About 15% (20­25% now) of adults complain about sleep disorders 1. Insomnia ­ Most common ­ Difficulty getting to sleep or staying asleep ­ For some, expectations fall short  o Sleep 5 hours, but expect 8 hours like other people ­ Situational Insomnia: Specific stressor due to specific incident in life o Once dealt with, regular sleep pattern returns ­ Chronic Insomnia: Possibly circadian rhythm problem o Difficult to treat o Cause: Thermoregulation problem (Failure to lower body temperature)  Activation remains high and normal sleep cycle fails to develop 2. Sleep Apnea ­ Interruption in breathing during sleep ­ This is normal… but people with disorder do not start breathing again unless they  wake up ­ Severe disorder ­ May stop breathing for about 1 minute, hundreds of time a night leading to insomnia ­ If the cause is obstruction of air passage (loud snoring), easily treated with breathing  machine ­ If the cause if abnormal brain function, timing cycle is off, not easily treated ­ Many believe Sudden Infant Death Syndrome is a case of Apnea 3. Narcolepsy ­ Much more common than thought; affects 2­8% of population ­ Person suddenly falls asleep at odd times  ­ Muscle weakness thus falls down ­ Person immediately enters REM which isn’t the problem, but falling down is (hit  head) ­ Causes: o Abnormal timing cycle for REM o Depleted supply of 
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