Does Sleep Regularity actually make a difference, or is it overhyped?

Sleep regularity has emerged as an active and increasingly well-supported area of research, with recent large cohort studies (UK Biobank, MESA) finding that day-to-day consistency of sleep timing predicts cardiovascular disease and mortality risk, in some analyses more strongly than sleep duration itself. Weighing the data: Sleep Regularity looks potentially significant but still under-researched — its estimated impact on longevity is rated high (58/100), while the evidence itself is only moderate (65/100).