Home / Health / Night Light Harms Heart: Study Reveals Risks
Night Light Harms Heart: Study Reveals Risks
13 Mar
Summary
- Bright light at night disrupts circadian rhythms, increasing heart disease risk.
- Study links bright night light to 32% higher coronary artery disease risk.
- Reducing night light exposure can protect cardiovascular health.
A recent study published in JAMA Network on October 23, 2025, highlights a significant link between nighttime bright light exposure and an increased risk of heart disease. Exposure to bright light after sunset disrupts the body's internal clock, known as the circadian rhythm, which regulates essential physiological processes.
This disruption can lead to elevated blood pressure, inflammation, and a faster heart rate. The research found that individuals exposed to the brightest night light had a 32% higher risk of coronary artery disease, a 56% increased risk of heart attack, and a 30% higher risk of stroke. These risks persisted regardless of other lifestyle factors.
Cardiologists emphasize that artificial light suppresses melatonin production, leading to elevated stress hormones and negatively impacting heart health. Simple changes like using dim, warm lighting, enabling night mode on devices, and using blackout curtains can mitigate these risks.
Experts stress that light hygiene is as crucial as nutrition and sleep for maintaining cardiovascular health, suggesting it should be treated with similar importance in daily wellness routines.
