Darken Your Night to Protect Your Heart
New research presented at the American Heart Association's 2025 Scientific Sessions links higher nighttime exposure to artificial light with increased brain activity related to stress, arterial inflammation, and a higher long-term risk of cardiovascular events. The mechanism goes beyond melatonin suppression, as nighttime light activates the body's fight-or-flight system, potentially harming heart health over time. Practical tips include darkening bedrooms, using warm evening lighting, imposing a digital curfew on devices, and minimizing outdoor light to protect circadian rhythm and cardiovascular health.