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> Genetics, diet, microbiome, epigenetics, sleep habits, study habits, social health, seasonality, etc all likely play some role in the way people metabolize caffeine.

> And personally I believe given the right conditions anyone might get to experience the effect of caffeine actually making them sleepy.

There was a 6 month time in my late 20s when I was averaging 3.5 hours of sleep during the week while working two jobs and going to school. The third energy drink of the day seemed to signal my body to be tired.

Years later with a much better life balance and fully off of caffeine for months at a time a single 12 ounce can of Coca-Cola at lunchtime was enough to keep me wired until late into the evening. Some time after that, while fully off of caffeine for about a year, 80 mg accidentally ingested from caffeinated protein bars disrupted my sleep deep into the night and took a couple of days to recover from.

I could definitely do better with procrastination, and sometimes have trouble focusing, but am pretty sure I don't have ADD/ADHD.



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