Published: September 8, 2025
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Most people don’t know this: The World Health Organization classifies night shift work as a probable cause of cancer. Artificial light at night destroys your health more than you think. Here’s the breakdown: 🧵

The cancer research arm of the WHO categorizes night shift work as a probable carcinogen. Same category as: • UV radiation • A chemical found in fried foods (acrylamide) • A substance in tobacco smoke (benzoapyrene) 1 in 5 workers worldwide is exposed daily.

Image in tweet by Craig Brockie

Why? Because light at night destroys your circadian rhythm. Exposure to typical indoor light after sunset suppresses melatonin by 50%. Melatonin isn’t just a sleep hormone, but also a tumor suppressor. Half your body’s defense is gone with one late Netflix binge.

The fallout is massive: • Genes are affected by circadian changes • DNA repair goes offline • Cortisol/insulin spike at the wrong times • The immune system detects cancer less effectively Breast, prostate, and colon cancers all rise with chronic circadian disruption.

Image in tweet by Craig Brockie

Even your mitochondria, the cell’s power plants, go out of sync. They’re designed to follow daily light/dark cycles. Artificial light + night work = oxidative stress, energy crashes, premature aging. Your cellular engines start running off rhythm.

Image in tweet by Craig Brockie

So what’s the antidote? Neurosurgeon @drjackkruse swears by one ritual: See the sunrise. Every single day. According to Kruse, doing this will solve 70–80% of your health problems. Sounds unreal, but the biology is undeniable:

Sunrise programs the master clock in your brain. Just 20 minutes outside at sunrise: • Sets your cortisol rhythm • Primes serotonin + dopamine • Programs nighttime melatonin release Your entire day runs on that signal.

Image in tweet by Craig Brockie

But then comes the enemy: blue light at night. LED bulbs and the blue glow from your phone trick your brain into thinking the sun is still up. Result: poor sleep, low melatonin, higher rates of depression. Our ancestors only saw blue light from the sun. Never at night.

Image in tweet by Craig Brockie

Simple rules to follow: • No screens 2–3h before bed • Switch to incandescent bulbs/candles • If screens are unavoidable, wear blue light-blocking glasses Protect nighttime darkness.

Light isn’t the only disruptor. We live in an invisible field of radiation: WiFi, Bluetooth, and 5G. Dr. Kruse warns: This radiation causes a stress response that simulates leptin [hormone] resistance, panic, and even heart attacks.” Even if you don’t feel it, your cells do.

Image in tweet by Craig Brockie

Action steps: • Avoid wireless headphones • Use airplane mode often • Ground yourself, barefoot on grass or with a grounding mat These simple tweaks can reduce damage caused by radiation dramatically.

While going outside barefoot is best, it doesn't always fit into my schedule. I created the ULTIMATE Grounding Mat to make it easier to get the benefits of grounding. I place it under my computer so I stay grounded while I work. https://www.amazon.com/dp/B0DM...

If you want to push further, utilize cold. Cold exposure: • Burns visceral fat • Improves insulin sensitivity • Optimizes mitochondria

Tap into the same pathway. Start small: • 30s cold shower at the end of your hot shower • Progress to 50-55 degree bath water for 5 mins Cold forces weak mitochondria to die and strong ones to thrive. You literally rebuild your cells to run cleaner.

Our ancestors thrived on a ketogenic, protein-rich diet. • High omega-3, low omega-6 (ideal ratio: 4:1) • Low carbs • Fat and ketones as primary fuel Modern humans? TONS of carbs = metabolic disaster.

Image in tweet by Craig Brockie

The solution is to return to our natural blueprint: • Watch the sunrise • Darkness at night • Cold exposure • Grounding • Ketogenic diet Health comes from doing what nature intended.

Our biology remembers how to be healthy. We just need to give it the right cues. The hidden carcinogen epidemic is man-made. But reversal is also in our hands. Realign with nature’s rhythms, and your body will do the rest.

A bit about me: 30 years ago, I was in chronic pain, with crippling anxiety and a broken immune system. Since then, I’ve invested 7 figures researching the best health and performance-enhancing methods worldwide. This account exists to help you live your best life.

Image in tweet by Craig Brockie

How do you sleep when you're on your phone in bed? Follow me @craigbrockie for more evidence-based health insights to improve your health and longevity.

@craigbrockie @NavalismHQ What if you’re a night owl ?

@aishahidk @NavalismHQ If it works best for you, or this is unavoidable due to your situation, make sure you make it consistent. Bright light while awake, blackout sleep cave during your “night,” and make it a routine. The most damage is from being a night owl and living an unhealthy lifestyle with

@craigbrockie When we fight nature’s rhythms, the body always keeps the score, and night shift work is proof.

@ShadowWorkPro Well said.

@craigbrockie Excellent book👇 A single poor night sleep can effect infection risk, efficacy of vaccines , and cancer risk as state above. But, it is deeper than just melatonin hormone. It is entire immune system dysfunction from metabolic dysfunction that is caused by poor sleep. Obesity,

Image in tweet by Craig Brockie

@craigbrockie The WHO got this one right. Night shift work disrupts your circadian rhythm - the master controller of cortisol, melatonin, and immune function. When these get out of sync, you're creating the perfect storm for cellular dysfunction. Cortisol and melatonin work on precise timing

@craigbrockie Amazing share

@craigbrockie ¡Increíble!Definitivamente hay que prestar atención a estos temas de salud.

@craigbrockie thanks,great share

@craigbrockie @tyromper My one question is how about emergency shift workers. Police, firemen and ambulance drivers they all work shifts and some of those include the night time. As well hospitals run 24/7. Does this mean they are more prone to cancer just because they are up at odd hours?

@craigbrockie @NavalismHQ The WHO lacks credibility. If you work at night, just go out in the daylight/sun for a while. Take D3.

@craigbrockie Thank you, it was very useful‌👌

@craigbrockie Great share

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