Deep sleep (slow-wave sleep, N3) is the most restorative phase of the sleep cycle. It is characterized by slow delta waves and is essential for physical recovery, memory consolidation, and adenosine clearance.
Key Functions
- •Adenosine clearance — sleep debt is "cleared" during deep sleep
- •Tissue repair — growth hormone release, cellular restoration
- •Temperature drop — core body temperature must drop 1–2°C to initiate
- •Immune function — critical for immune system maintenance
In ONDA Life
The Temperature Down-Regulation protocol supports deep sleep: a warm bath 90 minutes before bed or a cool bedroom (18°C) helps the core temperature drop. This "Thermal Handshake" signals the brain that it's time for the most restorative phase.