I heard about tea helping people to keep a relaxed and alert state of mind so that might help but, hahaa, i came across this addictive site while searching for info, haha, if you guys like to challenge your mind try this brain exercise thingy...its great for a time killer, and you'd probably need a tea afterwards..pwuahahaha
http://braintrain.com.au/
http://braintrain.com.au/