The rhythmic bursts of brain activity that occur during NREM-2 sleep are called:

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The rhythmic bursts of brain activity that occur during NREM-2 sleep are called sleep spindles. Alpha waves are associated with relaxed wakefulness or meditative states, delta waves typically occur during the deepest stages of sleep, and K-complex waves are sudden, high-amplitude bursts of brain activity that occur during NREM-2 sleep in response to external stimuli.

The Rhythmic Bursts of Brain Activity That Occur During NREM-2