An NIH-supported study reused the single-lead ECG collected during polysomnography but often left underanalyzed. The model combined ECG signals with expert-labeled sleep stages, was fine-tuned on 15,809 Massachusetts General Hospital patients, and evaluated on 9,810 patients at Emory and 12,576 at Beth Israel Deaconess. Its scores still separated future risk for atrial fibrillation, heart failure and all-cause mortality after adjustment for age, sex, BMI, diabetes, hypertension, sleep-apnea severity and sleep efficiency. It did not yet predict myocardial infarction and stroke well enough, and the study does not show that using the score improves clinical outcomes. Its promise is to turn existing sleep tests and potentially low-cost single-lead patches into an additional screening entry point.