Is Circadian Rhythm good for cardiovascular health?

Yes — the evidence for this is strong. Shift work is the best human model for studying real-world circadian disruption, and the evidence here is unusually consistent: two independent dose-response meta-analyses find shift work increases cardiovascular disease morbidity and mortality, and a more recent meta-analysis of night shift work specifically confirms elevated cardiovascular risk indicators. That's reflected in an evidence score of 72/100 for its role in cardiovascular health, drawn from 9 studies, with an estimated impact on longevity rated moderate (60/100).