The 6.4 to 7.8 Hour Sleep Window: Dialling In Your Longevity Sweet Spot
If you track your sleep, you have probably asked yourself the optimiser’s question: what is the actual number? Not the NHS range of seven to nine hours, but the specific duration, for your body, that ages you slowest. A 2026 Columbia University study has put the tightest evidence-based answer yet on the table: across 23 […]