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N3 Sleep Stage

Meaning

The N3 Sleep Stage, also known as Slow-Wave Sleep (SWS) or deep sleep, represents the period of lowest arousal threshold characterized by high-amplitude, low-frequency delta waves on the EEG. This stage is physiologically critical as it is the primary window for physical restoration, tissue repair, and the pulsatile release of anabolic hormones like Growth Hormone (GH). Clinically, the density and duration of N3 sleep are primary indicators of recovery status and overall physiological load management. Adequate N3 is non-negotiable for endocrine recovery.