How many studies support Sleep Regularity?

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. That's backed by 6 published studies in Vitaebase's database, the most recent from 2025 -- a modest but real research base.