What type of electrical activity indicates a transition from Stage 1 to Stage 2 sleep?

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The transition from Stage 1 to Stage 2 sleep is characterized by the appearance of sleep spindles, which are bursts of rapid and rhythmic brain wave activity. Delta waves are typically observed in deeper stages of sleep, such as Stages 3 and 4, while beta waves are characteristic of wakefulness. Alpha waves are also typically associated with wakefulness or relaxation and are not typically observed during sleep.

What Type of Electrical Activity Indicates a Transition from Stage