Sleep is the highest-leverage thing you can optimise — nothing else improves your body, brain, and mood as broadly, and nothing else fails as quietly. The goal of a world-class protocol isn't a perfect score in an app; it's enough sleep, at a regular time, deep enough to restore you. Everything here serves that.
While you sleep, the brain consolidates memory, clears metabolic waste (the glymphatic system), and rebalances hormones, metabolism, immunity, and emotion. Chronic short or broken sleep raises the risk of heart disease, high blood pressure, type-2 diabetes, dementia, depression, and early death. No supplement stack outperforms simply sleeping well — which is why sleep, not the latest peptide, is the real foundation of health. Evidence ●●●●●
The single most important truth in this whole guide: you cannot biohack your way out of too little sleep. Gadgets and supplements optimise the margins — they don't replace hours in bed. The genuine short-sleeper gene (DEC2/ADRB1) is real but vanishingly rare; 'I only need five hours' is almost always accumulated debt you've stopped noticing, because the sense of impairment fades long before the impairment does. Evidence ●●●●○
Three things, in order: enough (duration), regular (same times every day), and undisturbed (deep, unfragmented). Nailing those three matters far more than optimising any exotic metric — a perfect magnesium stack can't rescue a chaotic schedule or an untreated snore. Get the fundamentals first; then tune the margins with everything that follows.
How to read the evidence dots
Throughout this guide, ●●●●● means strong, replicated evidence and ○○○○○ means essentially unproven. Sleep is a field thick with gadgets and marketing, so the grades matter: they separate the levers that move the needle from the ones that just move product.
The Sleep Guide