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Stage 1 sleep marks the threshold between wakefulness and sleep, a fleeting interlude characterized by a deceleration of brain activity and physiological processes. During this brief phase - typically lasting only a few minutes - alpha waves give way to theta rhythms, eye movements slow, and muscle tone begins to…

• Which stage is characterized by the appearance of sleep spindles and K-complexes?
• Which phase is marked by dominant delta brainwaves and is critical for physical recovery?