Lecture 2- Sleeping - 2. Science of Sleep -altered state of...

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2. Science of Sleep -altered state of consciousness in which the body can repair itself -closed eyes -snoring -pulse is slower and regulatory -not moving –can wake them up -measure brainwaves -not conscious of the surroundings • Definition -Loss of external awareness -Disconnected thoughts -Disorientation in time and space -Images and dreams -Important for memory and good health -strengthening neural connections that serve as the basis of learning • Behavior -circadian rhythms (time and night): the regulation of biological cycles into regular patterns-> controlled by light and dark but still continue when light cues are removed ex. Humans sleep at night- lack of light dancer -horizontal position -low muscle tone -Non-responsive, but reversible -Sleep rebound after deprivation •Physiology- changes in the brain and body- electrical brain avtivity==polysomography 1. Electrooculogram (EOG)- Eyes 2. Electroencephalogram (EEG)- Brain 3. Electromyogram (EMG)- Muscles
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-Cyclic cycle: evolution, avoid threats, obtaining food, hiding, attacking, acquire all types of sleep EOG EEG EMG
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•Stages of Sleep: Sleep occurs in 90-minute cycles throughout the night, more REM dominant later Alert wakefulness- Beta waves: short, frequent, desynchronized Just Before awakening- Alpha waves 1. Non-Rapid Eye Movement sleep(NREM)Sleep Stage-1 NREM (theta waves) Stage-2 NREM (sleep spindle and K complex): regular breathing, less sensitive to external stimulation Stage-3 NREM (delta wave) Stage-4 NREM 2. Rapid Eye Movement sleep (REM) : marked by dreaming and paralysis of motor systems -flurry of beta wave activity -eyes dart back and forth rapidly -occipital cortex and brainstem regions are more active, but muscles are paralyzed -longer sleep= REM sleep more *Is sleep biphasic? Most people get tired in the early afternoon… maybe that power nap is good for you! Questions Why does it cycle? - Evolutionary: we can be vulnerable for too long so the body only does this so that we can wake up - So that we get all kind of the sleep during a say 4 hours cycle If you take a sleeping pill, is it the same? Why do you feel more tired the more sleep you get?
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This note was uploaded on 10/28/2010 for the course PSYCH 2 taught by Professor Don'tremember during the Fall '04 term at University of California, Berkeley.

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Lecture 2- Sleeping - 2. Science of Sleep -altered state of...

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