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NREM (NON-rapid-eye-movement sleep) lasts about 90 minutes
- Stage 1– very light sleep from which it is easy to wake up
- Stage 2–a slightly deeper sleep, lasts for about 15-20 minutes; characterized by short bursts of rapid, high amplitude brain waves known assleep spindles.
- Stage 3 & 4- deep sleep; delta waves(slow, lazy brain waves) present
REM sleep is primarily characterized by movements of the eyes and is the fifth stage of sleep.
AP TEST ITEMS- Know REM sleep is highly correlated with dreams & that sleep spindles occur in Stage 2 sleep
Sleep Stages & Brain Activity
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