Sleep isn’t just “recovery time”—it’s when the brain actively drives growth hormone release through a tightly controlled neural circuit that only functions properly during stable REM and NREM sleep. This study shows that both the timing and quality of sleep directly determine how much repair, adaptation, and metabolic recovery your body actually gets. If sleep is inconsistent or fragmented, you’re not just tired—you’re limiting your ability to recover and improve, no matter how good your training is.
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