PSY1 Notes3

PSY1 Notes3 - Sleep Psy 1 Lecture Notes Alan J. Fridlund,...

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Sleep Psy 1 Lecture Notes Alan J. Fridlund, Ph.D. Polysomnography EEG – Electroencephalogram EOG – Electrooculogram EMG – Electromyogram EKG – Electrocardiogram RR – Respiration rate O2 / CO2 saturation / desaturation “Dual Sleep” Non-REM Sleep REM Sleep Stage 1 Stage 2 Delta EEG Changes During Sleep (Picture) Qualities of Dual Sleep All mammals seem to have dual sleep except monotremes (e.g., anteaters) and cetaceans (e.g., whales). Sleep-wake cycle governed by an internal 25-hour circadian rhythm , tuned externally to 24 hr by the sun. REM periods alternate with Non-REM periods according to a 90-100 minute ultradian rhythm . REM periods last longer as the night progresses. REM sleep can be exhausting. REM Sleep Across the Life Span (Picture)
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Sleep and Aging People sleep less as they get older, and the proportion of time in REM sleep decreases. Overall sleep gets lighter and wakefulness gets ‘sleepier.’ Aging is often accompanied by chronic sleep deprivation due to: illness, pain, breathing problems, frequent need to urinate Stages of Non-REM Sleep Stage 1 – transition between wakefulness and clear sleep Stage 2 – first bona fide sleep stage; “point of no return” at onset Delta – deepest, most restful type of sleep Physiological relaxation Slow, rolling eye movements Mundane “talking” dreams Growth hormone secretions Deficient thermoregulation Characteristics of REM Sleep EEG similar to waking state Striate muscle tone greatly reduced Heightened physiological activity Rapid, jerky, desynchronous eye movements Erection of sexual tissue Vivid visual dreams Reduced by nearly all drugs / medications Striate muscle tone greatly reduced “REM without atonia” Sleep paralysis
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Typical Night’s Sleep 0’ - Go to bed 5-10’ - Enter Stage 1 Sleep 10-15’ - Transition from Stage 1 to Stage 2 Sleep “Point of No Return” (?) Myoclonic jerk 45’ - Transition from Stage 2 to Delta Sleep 70-90’ - 1st REM period (~ 5 min long) “REM latency” Alternates w/ Stage 2 sleep every 90-100’ every - Succeeding REM periods 90-100’ 420 - 480’ - Awakening (approx. 7 - 8 hr.) Sleep Through the Night (Picture) Brain Mechanisms in Sleep
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PSY1 Notes3 - Sleep Psy 1 Lecture Notes Alan J. Fridlund,...

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