Modern healthcare is exceptionally good at treating disease once it shows up. That's the problem. We wait for symptoms, confirm a diagnosis, prescribe an intervention. We're not built to prevent, and we're ignoring the lever that could change that. Chronic sleep deprivation raises risk for cardiovascular disease, metabolic disease, depression, and cognitive decline, all at once. It's not a single risk factor. It's a multiplier across almost every major condition dominating modern healthcare. National health strategies are largely silent on it. That's a serious gap. We now have sensors and ML that turn sleep into a continuous, real-time vital sign. Early detection at home. Interventions before deterioration becomes acute. Prevention without a clinical visit. This isn't surveillance. It's the earliest, most repeatable window into whether the body is moving toward resilience or breakdown. Governments that build this into their health infrastructure first will have healthier, more productive populations.