Regarding the brain activity and wave-pattern during REM sleep,

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All of these statements are true. REM sleep is characterized by a fast, irregular EEG pattern similar to Stage 1 sleep. During REM sleep, the brain activity looks as if the person is awake, with the exception of the lack of activity in the prefrontal cortex (which is associated with logical thinking and decision making). Lastly, research indicates that during REM sleep, brain areas associated with imagery and emotion are more active.

Regarding the Brain Activity and Wave-Pattern During REM Sleep