Night owls face higher heart risks due to schedule misalignment, but changes can help.

A large UK study of over 300,000 adults found that night owls have a 16% higher risk of heart attack or stroke and are 79% more likely to have poor cardiovascular health, according to American Heart Association metrics. The increased risk is linked to a mismatch between natural circadian rhythms and societal schedules, making it harder to maintain healthy habits like regular sleep, balanced diets, and avoiding smoking. While the association is stronger in women, experts say the risks are modifiable through consistent sleep patterns, quitting smoking, and lifestyle changes tailored to individual rhythms.