Caffine is quite interesting because I often got even more tired after 30 minutes drinking some coffee.
The first 30 minutes indeed got me very excited, but then I will fall asleep soon after.
The same thing happened to me right now with energy drink such as Redbull or Monster. Therefore I mostly drink them for some competitive activities that only last short hours
I'm the same with coffee as caffeine, but I can drink a sugar free energy drink (Moister Ultra) and the caffeine in that does the job without any of the sleepiness sideffects.
* Monster Ultra
Check for other supplements in that stuff like turine and b12 b1 stuff. They can help with focus and mental energy.
Absolutely does include them. The quietening effect the first can had had never been replicated. But I still chase the feeling.
If stimulants relax you then medication would probably help, as it operates on a similar method.