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