Certified Polysomnographic Technician (CPSGT) 2025 – 400 Free Practice Questions to Pass the Exam

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Which brain activity is typically observed during REM sleep?

Delta waves

Alpha waves

Beta waves

During REM sleep, the brain exhibits predominantly beta waves, which are similar to those observed during wakefulness. This brain activity is characterized by a lower amplitude and a higher frequency, typically ranging from 13 to 30 Hz. This pattern signifies an active brain, which is paradoxically engaged in vivid dreaming and processing during this phase of sleep despite the body's muscles being in a state of atonia.

The presence of beta waves during REM sleep reflects the brain's high level of activity that involves visual imagery and emotional processing, differing markedly from other sleep stages that show more synchronized and slower wave patterns, such as delta waves during deep sleep or alpha waves during relaxed, awake states. Recognizing the unique characteristics of brain activity in REM sleep is important in understanding sleep architecture and its various functions including memory consolidation and emotional regulation.

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Theta waves

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