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

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Beta brain waves are associated with high levels of activity and alertness, such as during periods of wakefulness and focused attention. They are not typically experienced during stage 4 NREM sleep, which is characterized by predominantly delta waves. However, beta waves may be present during REM sleep, which occurs after NREM sleep.

The Only Time That Most People Experience Beta Brain Waves