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.
I've had success using sunflower seeds to keep alert on the days where caffeine is insufficient.