Final answer:
During REM sleep, activity in the frontal and parietal lobes is reduced. This aligns with the dream logic and reduced need for sensory processing typically present during REM sleep.
Step-by-step explanation:
The lobes that are not active during REM sleep are typically the frontal and parietal lobes. These regions are known for their roles in logical reasoning, decision-making, and sensory processing. During REM sleep, dreams are vivid and often illogical, which aligns with reduced activity in these areas. It makes sense for these lobes to be inactive during REM sleep because dreaming does not require the logic and decision-making that is associated with wakefulness. Moreover, reduced sensory input during sleep would mean less need for processing in the parietal lobe.