Growth hormone (GH) surges during NREM Stage 3 deep sleep. This is not optional physiology — it is the primary window for tissue repair, muscle recovery and metabolic regulation.
Up to 75% of daily growth hormone secretion occurs during the first 90 minutes of deep sleep. Disrupted or insufficient deep sleep directly reduces GH output.
Growth hormone supports muscle protein synthesis, fat metabolism, bone density and immune cell production. As men age, both deep sleep duration and GH production decline in parallel.
Consistent sleep schedule (same time daily), cool bedroom (65 to 68°F), total darkness, no alcohol within 3 hours of bed and Ashwagandha in SodaPeak to lower cortisol at bedtime.