I play indoor league every Monday @9pm. Since around 9pm, I get really tired and sleepy. I drank some tea 1/2 hr before the match so it would pep me up and make me more alert. Well, during the match I was so gittery and nervous that I could not focus. In addtion, I ended up staying awake till 3am bc of the caffiene. Is there something that I can take that will really boost my energy level for a short period of time, while help me to focus and not keep me up all night?