Modern medicine has lost its way, and trust in the current health system is at an all-time low. I don’t blame you for being skeptical. The word “doctor” comes from the Latin root for “teacher.” As a naturopathic physician, my job isn’t to push pills; it’s to teach you how to dismantle the medical BS and take your health into your own hands.
Today, we need to address a silent toxin in your home: Artificial Light at Night (ALAN). This article is a companion to my latest podcast episode.
If you’re scrolling on your phone, tablet, or watching TV in the dark, you are unknowingly sabotaging your biology. We have been “light-polluted” since the lightbulb hit the scene, but our screens have taken it to an extreme. We are exposed to intensities that our ancestors never encountered, and it is destroying our circadian rhythm.
The “Why”: Why Your Brain is Screaming
Your body relies on a master internal clock located in the hypothalamus called the suprachiasmatic nucleus (SCN). This piece of machinery has a direct line of sight from your eyes through the optic nerve. When light hits your retina, the SCN receives a signal.
Think of melatonin and cortisol as a seesaw. Cortisol, the “get up and go” hormone, should be high in the morning and taper off by evening. Melatonin is the opposite—it is your sleep signal. Darkness is the trigger for melatonin.
Here is the problem: Modern light—especially blue light—is incredibly potent. Even a low-intensity light, as low as eight lux (about half the brightness of a standard hallway nightlight), is enough to suppress your melatonin production. If you’re staring at a smartphone or tablet in the dark, you’re exposing yourself to light intensity roughly 100 times brighter than the full moon. You are sending your brain a “mixed message” that says it is daytime, effectively shutting down the hormone you need for deep, restorative sleep.
The Evidence: Mitochondria and Beyond
The impact of this isn’t just “tiredness” the next morning. It goes down to the cellular level.
Melatonin is a vital signal to your mitochondria—the CEOs of your cells. Mitochondria manage energy production, waste processing, and oxidative protection. When you lack melatonin, you cannot produce enough of the SIRT3 enzyme, which is critical for energy production, DNA repair, and metabolism.
Furthermore, consider the cancer connection. We know cancer cells struggle to handle oxidative stress because they lack sufficient catalase (an enzyme that converts hydrogen peroxide into harmless water and oxygen). In a healthy cell, melatonin acts as a shield against oxidative damage. In a cancer cell, high levels of melatonin can act like a sword, pushing the cell past its limit to tolerate oxidative stressors. By failing to regulate your light exposure, you may be depriving your healthy cells of a protector while potentially failing to inhibit the mechanisms that allow cancer cells to survive.
Immediate Action: Here is What You Do Tomorrow
You don’t need a medical degree to fix this. You need to treat light like a toxin. If you want to take your health back, implement these four steps immediately:
The Two-Hour Rule: Stop all screen use (phones, tablets, computers) one to two hours before bed. If you need to read, use a physical book or an e-reader with an e-ink display that doesn’t emit backlight.
Dim the House: Stop leaving all your house lights on until the moment you crawl into bed. Install smart bulbs that you can program to automatically dim or turn to an amber/red spectrum after sunset.
Wear Blue Light Blockers: If you absolutely cannot avoid screens in the evening, invest in a quality pair of blue-light-blocking glasses. They aren’t a cure-all for poor habits, but they are a solid defensive measure.
Invest in a Real Sleep Mask: You cannot control every environment, but you can control your own. Get a high-quality, comfortable sleep mask (I personally use Manta) that blocks out 100% of light. This is your insurance policy for deep sleep.
Don’t take my word for it. Go research the connection between circadian rhythms and health outcomes. Science moves forward when we ask questions, not when we accept that “the science is settled.” Take charge of your environment—your health depends on it.