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Deep NonREM Sleep

Meaning

Deep NonREM Sleep, specifically encompassing Stages N3 or slow-wave sleep, is the most restorative phase of the sleep cycle, characterized by high-amplitude, low-frequency delta brain waves. During this critical period, brain metabolic activity decreases significantly, and the body initiates profound physiological repair processes. Clinically, adequate time spent in deep sleep is strongly correlated with optimal hormonal regulation, including the pulsatile release of growth hormone. This phase is essential for physical restoration and energy conservation.