Quite good support for the caffeine/theanine interaction in the literature -- I was mainly trying to see if it could improve sleep which is why I didn't take it with caffeine. Would be interesting to do some blinded cognitive test at some point though to get some estimate on how much congitive performance is increased. I need to think about ways to measure that, aside from flashcards. I actually have the website connected to a chess API so that might be a nice test.