I don't know why people say that, but in my case I have felt asleep just after some minutes drinking my coffee.
Also, I drink my coffee more like as a drink along with my food than drink it as it is. I never drink coffee alone.
So is it just your idea that is addictive or keeps you awake?
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The dude above me googled it haha, then told you a summary of the wiki page. Coffee is not a drug it is a stimulant. It works by speeding up your heart rate, bloodflow, and neutrient intake, which increases your brain's functioning abilities. Ergo, it could have a lesser effect based on your body since we are all different, or you could need to eat healthier/more food with it.1