Skip to main content

Deep Sleep Phase

Meaning

The Deep Sleep Phase, also known as slow-wave sleep (SWS) or Non-Rapid Eye Movement (NREM) Stage 3, is the most restorative stage of the sleep cycle, characterized by high-amplitude, low-frequency delta brain waves. Physiologically, this phase is critical for physical recovery, cellular repair, memory consolidation, and the pulsatile release of key anabolic hormones. Achieving adequate time in this phase is non-negotiable for metabolic and hormonal health.