Largest medical insurance company (Discovery Health) in South Africa has just launched a sleep rewards program as part of their wellness program (Vitality). The idea is that you get rewarded for getting good sleeping scores... which is not entirely in your control, but anyway. Their model is built by looking at years of sleep data combined with health insurance claims. They place a large emphasis on sleep regularity. Anyway, just interesting to see this study come up and it seems to match up sort of with the Vitality stuff. There will ofc be many confounding variables though...