AP Psychology Stages of Sleep
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10 Terms
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NREM Stage 1
alpha and theta waves
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NREM Stage 2
theta and start of delta waves
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NREM Stage 3 and 4
delta brain waves
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REM sleep
beta brain waves
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NREM Stage 1
lasts only a few minutes
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NREM Stage 2
start of true sleep
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NREM Stage 3
considered this stage when 20% of brain activity shows delta waves
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NREM Stage 4
considered this stage when delta waves exceed 50% of brain activity. Person does not experience sensory stimulation - hard to wake up
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REM sleep
brain activity becomes more active
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approximately 85% of dreams occur during this stage. eyes move rapidly back and forth beneath eyelids
Note 
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