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Lecture

Sleep

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Department
Psychology
Course
PSY 1
Professor
Fridlund
Semester
Spring

Description
Polysomnography - EEG - electroencephalogram - EOG - Electrooculogram - eye movement - EMG - Electromyogram - EKG - Electrocardiogram - RR - Respiration Rate - O2/CO2 - Saturation/desaturation Dual Sleep - Non REM Sleep - - Stage 1 - Stage 2 - Delta = Stage 3 & Stage 4 - - delta waves most prominent in this stage - brain waves are very slow - REM Sleep - Sleep goes from 1-2-3-4-3-2-REM - Sleep cycles each are about 10 mins Qualities of Dual Sleep - all mammals have dual sleep except - monotremes (anteaters, platypus) & cetaceans (whales, dolphins) - Sleep wake cycle governed by an internal 25 hour clock circadian rhythm - tuned to 24 hours by sun - REM Periods alt with non-rem according to 90-100 min ultradian rhythm - REM periods last longer as night progresses - REM sleep can be exhausting - Babies have most REM sleep and this slowly goes down with age Sleep and Aging - Sleep bocmes lighter & wakefulness becomes sleepier - people sleep less as older & proportion of time in REM decreases - Aging is ofton accompanied by chronic sleep deprivation due to illness, pain, breathing, peeing STAGES - 1 - transition between wakefulness and clear sleep - 2 - first bona fide sleep stage point of no return at onset - 3/4 - Delta - - deepest most relaxed sleep - physiological relaxation - slow rolling eye movement - mundane talking dreams - growth hormones secretions - deficient thermoregultion - REM - - reg similar to waking state - heightened phisiologocal ctivity - rapid jerky eye movements - erection of sexual tissues - vivid visual dreams - secreting stress hormones - reduced by nearly all RREM sleep - sleep paralysis - cat atone Cetacean Seep - dolphin - left hemisphere sleeps - right awake; then they switch places - need this rather than Rem because they have to stay swimming or would die Typical sleep 0 - go to bed 5-10 - hypnogogic hallucinigations - enter stage 1 sleep 10-15 - point of no return bridge between stage 1 & 2; Myoclonic jerk 45 - transition from 2 to delta 70-90 - 1st REM period about 5 mins long; "REM latency; alternates with stage 2 every 90-100 mins 90-100 - succeeding REM periods 420 - 480 - Awakening 7-8 hours Brain Mechanisms in Sleep - sleep onset i triggered by release of melatonin from pineal gland - PG is controlled by Pacemaker neurons in Suprachiasmatic nucleus of the hypothalamus which regulates circa rhythm - switches between REM and NREM sleep are controlled by multiple areas in hind brain (pons) and midbrain (reticular formation) - dreams are initiated by the refrohtal lobe Sleep theories Anti predator adaptation - forces us to be quiet at certain times of day Restorative - sleep yeps us recover something depleted during wakefulness Facilitates learning - sleep (rem mostly) might help us consolidate memories Thermoregulatory - sleep keeps us from overheating and helps conserve energy all wrong Dreams - We dream in Rem and Non Rem - REM dream is more visual and active - Dream time is real time - no dream condensation - Few dreams are bizarre - usually daily preoccupations - Themes of dreams vary little after l
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