Stage 2 sleep lasts only about 10 to 20 minutes and is characterized by these sudden short bursts of higher voltage brain activity

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Stage 2 sleep is characterized by the presence of sleep spindles, which are sudden short bursts of higher voltage brain activity. K-complexes occur during stage 2 sleep as well but they are not specifically about higher voltage brain activity like sleep spindles. REM dreams and hypnogogia occur during different stages of sleep.

Stage 2 Sleep Lasts Only About 10 to 20 Minutes