Sleep review - 1 Sleep Stages We descend into sleep...

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Complete sleep cycle 1,2,3,4,3,2,REM=90 minute 1) Sleep Stages We descend into sleep Cycles change as time goes on Less time in higher stages (see graph above only stage 4 in first three hours(slow wave sleep-3,4) REM increases in morning hours EEG’s (electroencephalograph measures brain activity) Wakefulness Beta waves high frequency tight waves at low amplitude 13-30 Hertz …indicate awake Before sleep Alpha waves medium frequency medium amplitude 8-12 hertz …indicate relaxation
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Stage 1 Low frequency high amplitude 4-7 HZ 5 percent of sleep time theta waves Stage 2 Still transitional but pretty much asleep Theta Waves Contain sleep spindles-low amp high freq bursts K complex-high amp low freq bursts-help keep you asleep-less with age Lack of k complex and spindles will lead to easy waking 20-25 minutes Stage 3 Part of slow wave sleep 2 different wave patterns Theta (70%) and Delta(signal slow wave) (30%) Large amp low freq less than 3 HZ Transition into slow wave Stage 4
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Deepest sleep (slow wave) Delta Waves
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