How many studies support Consistent Sleep Schedule?

Evidence specific to fixed bed and wake times draws mainly on a randomized sleep-education trial in college students and observational research on circadian misalignment's effects on cortisol and inflammation, alongside broader reviews of circadian sleep-wake phase disorders. That's backed by 5 published studies in Vitaebase's database, including 1 randomized controlled trial, the most recent from 2019 -- a modest but real research base.