https://www.naturalnews.com/2026-08-16-modern-night-habits-are-fueling-heart-disease.html
This is an issue for me: sometimes I read the news on my phone late into the night . I'm getting better at turning it off and keeping it off at night
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Why darkness is non-negotiable for heart health
The mechanism is rooted in circadian biology, the body's innate 24-hour master clock that governs nearly every organ system. For the cardiovascular system, this rhythm is essential. Blood pressure and heart rate naturally dip at night, giving the heart and vessels a period of vital rest. Inflammatory processes calm, and the nervous system shifts into a restorative state. This nightly reset is commanded by the brain's response to environmental light and dark.
Artificial light at night, particularly the blue-rich light emitted by LEDs and screens, sends a conflicting signal to this master clock..."