New Study Links Sleep Consistency to Lower Cardiovascular Risk

A large observational study published this week found that people who kept consistent sleep and wake times had meaningfully lower rates of cardiovascular events over a decade of follow-up, even after accounting for total sleep duration. Researchers tracked wearable-device data from tens of thousands of participants across multiple sites.

The findings suggest that sleep regularity, not just quantity, may play an independent role in heart health, according to the study's lead authors. Participants with the most variable sleep schedules showed risk levels comparable to those with several other established cardiovascular risk factors.

Outside researchers cautioned the study is observational and cannot prove causation, but called the results a useful signal for future clinical trials. Public health experts said the findings reinforce existing guidance to maintain steady sleep routines, particularly on weekends.