The only time that most people experience beta brain waves is in stage 4 NREM sleep.

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Beta brain waves are typically associated with wakefulness and active mental processes such as problem-solving, decision-making, and concentration. During stage 4 NREM sleep, the dominant brain waves are delta waves, which are characterized by slow oscillations and low frequency. Other brain waves typically seen during wakefulness, such as alpha and beta waves, are not commonly observed during deep sleep.

The Only Time That Most People Experience Beta Brain Waves