Signal 🌄

You make a cancer-fighting chemical in your brain every night. It kills tumor cells and fixes broken DNA while you sleep. Only works in the dark. The hormone is called melatonin, and when you flip on the lights at 2 AM, your brain stops making it. Melatonin is the sleep hormone. But it moonlights as your body’s overnight cancer patrol. It chokes off the blood supply to tumors and wakes up your natural killer cells (the white blood cells that hunt down cancer). Melatonin also flips on genes that order damaged cells to stop dividing. Researchers at Tulane ran an experiment where they exposed rats to dim light at night. Not bright light. Dim. The tumors lost their natural growth rhythms and grew nonstop. The WHO classified night shift work as “probably carcinogenic” in 2007. Reviewed everything again in 2019. Kept the classification. Same risk category as UV radiation. Your body’s internal clock controls more than when you sleep. It schedules DNA repair. There’s a repair protein called XPA that rises and falls on a 24-hour cycle, timed by your clock genes. When scientists knocked those genes out in mice, DNA repair went haywire and tumors grew faster. The same clock decides when damaged cells kill themselves off before they turn cancerous. Wreck the clock, you lose all of that. Denmark started paying workers’ comp for this. In 2008, the Danish government said: if you worked night shifts at least once a week for 20+ years and got breast cancer, that’s an occupational disease. Between 2007 and 2011, 110 women got compensated. One was a flight attendant who did 30 years of overnight flights for SAS airlines. No other country has followed. 1 in 5 workers worldwide works night shifts. In the US, that’s around 15 million people, mostly in healthcare, factories, and trucking. The exposure tilts hard toward people who can least afford it: 20% of workers without a high school diploma pull non-daytime shifts vs. under 2% of college grads. I’ll be straight with you, the science isn’t totally settled. A big 2020 analysis pooling 57 studies and 8.5 million people found no clear overall link between night shifts and cancer. But a 2024 study tracking how risk changes with time on the job told a different story: 9% higher breast cancer risk after 20 years of night work. 13% higher after 30. The lab evidence in animals is clear cut. The human data is messier, the way it always is when you’re studying something millions of people do in a thousand different ways.

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