Even dim artificial light (especially in the blue spectrum) can suppress melatonin production by up to 50%. This signals the brain that it is still daytime, delaying sleep onset and reducing sleep depth.

Wearing blue-light blocking glasses or dimming lights to sunset hues in the evening preserves the natural hormonal cascade required for high-quality sleep.

Your hormonal clock is set by light. Viewing blue light at night suppresses melatonin and can spike cortisol, confusing the HPA axis and leading to "adrenal fatigue" symptoms over time.

Melatonin is not just a sleep hormone; it is an anti-aromatase agent and a powerful antioxidant for the gonads. Chronic light pollution suppresses this protection, potentially contributing to lower testosterone and estrogen dominance.