How Light Controls Our Biology

This is how beautifully complex our circadian biology is, every system in our body, hormones, neurotransmitters, metabolism, sleep, even tissue structure runs on the rhythm set by our environmental input (light, darkness, temperature, and food timing... ).

At sunrise dopamine and cortisol begins to rise to mobilize energy and alertness, enhance mood, motivation, and mitochondrial priming. Serotonin precursors are triggered, histamine is disinhibited, satiety is decreased, hunger rises. TSH peak to anticipate metabolic demand. ACTH is cleaved from POMC. Cortisol and infrared light work on collagen and water to change tissue structure, literally waking the body by zipping and unzipping collagen, shifting charge and tensegrity.

Morning sunlight not only boosts mitochondrial energy production but also activates the raw materials we need to build dopamine, serotonin, and other neurotransmitters. As the day progresses, UVA light supports sex hormone pulses, thyroid activity, nitric oxide release supporting vasodilation, and mitochondrial biogenesis, regulating blood pressure and controlling skin chemistry, Serotonin is made, dopamine production is enhanced, Endorphins for mood and pain relief are released. while UVB shifts the body toward vitamin D production and glucose metabolism.

As light fades, the reverse unfolds, serotonin is converted into melatonin in darkness, guiding us into deep sleep cycles where the glymphatic system clears waste, tissues repair, and growth hormone surges. Magnetism dominates at night, condensing matter and restoring order, while melatonin acts as the security guard, and repairman of the brain and body.