Lecture16StressSleep

Lecture16StressSleep - Sleep and Dreaming What is sleep?...

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1 Sleep and Stress General Psychology March 4, 2010 Sleep and Dreaming –What is sleep? • Stages of sleep and wakefulness –What determines this cycle? –Why do we sleep? What controls the sleep cycle? • _________________________ –Responsible for controlling levels of alertness –Suprachiasmatic Nucleus (SCN) –Located in the Hypothalamus • ___________ – cyclical changes that occur on a roughly 24-hour basis in many biological processes Circadian Rhythm
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2 Hours of Sleep by Age Sleep • Before 1950s, most people believed that sleep like an on/off switch • Aserinsky and Kleitman (1953) – distinguished between REM and non-REM sleep • Dement and Kleitman (1957) –five stages of sleep Stages of Sleep and Wakefulness REM and Dreams • Most everyone dreams during REM sleep • We dream more in REM, but not exclusively • REM and non-REM dreams tend to differ but become more similar as a night’s sleep progresses • There is fair cross-cultural consistency in dreams
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3 Stages of Sleep and Wakefulness : A good night’s sleep Why do we sleep? Many negative consequences of sleep deprivation : –Accidents and circadian rhythm disruptions –4 days of severe sleep deprivation = hallucinations –Adverse health outcomes –Increased depression/anxiety –Death? • Rats deprived of REM sleep die within a few weeks, and rats totally deprived of sleep die even sooner Why do we sleep? Specific functions of sleep less clear. • Hypothesized functions: –Preservation and protection –Restoration –Growth –Part of metabolism –Facilitates memory and learning Sleep and Learning: Behavior Subjects solving problem
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4 Sleep and Memory Consolidation: Biology Cortex Sleep Disorders • ___________- fatigue associated with the inability to fall or stay asleep. • ____________- sleep loss due to the stopping of breathing (multiple times) throughout the night. • REM behavior disorder-
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This note was uploaded on 11/13/2010 for the course PSY PSY 001 taught by Professor Unknown during the Spring '10 term at UC Davis.

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Lecture16StressSleep - Sleep and Dreaming What is sleep?...

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