I myself drink 2 strong cups of coffee daily, 3 when I am really tired. Problem is, I can't really tell if it's the caffeine that is keeping me awake or simply

I myself drink 2 strong cups of coffee daily, 3 when I am really tired. Problem is, I can't really tell if it's the caffeine that is keeping me awake or simply the act of drinking something that does the trick. I'd guess it's a bit of both. I've had success using sunflower seeds to keep alert on the days where caffeine is insufficient.