By Lily Hautau, CNN(CNN) — If you’re someone who thrives after dark, you might want to pay extra attention to your heart health. Night owls — those who naturally stay up late — may be more likely to develop heart disease, a new study has found. Kianersi said the strong association between being a night owl and having poor overall cardiovascular health was most surprising. People who identified as early birds were 5% less likely to have poor heart health and habits compared with those in the intermediate group. He also noted that, as an observational study, the findings cannot prove that chronotype directly causes poorer cardiovascular health or increased cardiovascular risk.