Prolonged exposure to artificial light during nighttime may significantly increase the risk of cardiovascular diseases, according to a new study conducted by researchers in Australia.
The findings, published by the Flinders Health and Medical Research Institute, suggest that spending extended hours in the glow of mobile phone screens, televisions or bright household lighting after dark may disrupt the body's internal systems and contribute to serious heart conditions.
The study warns that exposure to artificial light at night is associated with a heightened risk of coronary artery disease, heart attacks, arrhythmias, and strokes. Researchers observed that even when other contributing factors such as sleep duration, dietary habits, physical activity, smoking and body weight were accounted for, the harmful impact of light exposure remained evident.
Medical experts involved in the study explained that the human body functions according to a natural internal clock — or circadian rhythm — which regulates sleep patterns, heart rate, and blood pressure. Exposure to bright light at night interferes with this rhythm, potentially leading to physiological imbalances.
“The body is not designed to be active under bright light during night hours. Artificial lighting affects hormone release and disrupts cardiovascular function,” said one of the lead researchers.
The study also found that women were particularly vulnerable to the cardiovascular effects of nighttime light exposure, with a higher risk of heart failure compared to men. Younger individuals, on the other hand, showed a greater tendency towards experiencing irregular heartbeats or arrhythmias.
In light of the findings, health professionals have issued renewed guidance to the public. They recommend reducing screen time in the evening, particularly during the hour leading up to bedtime, and using dim or ambient lighting to promote healthier sleep cycles.
"Simple lifestyle changes like turning off digital devices before bed and opting for soft lighting can make a significant difference in long-term heart health," the researchers concluded.
