[fauigerzigerk]

I have stopped paying attention (well, obviously not entirely) to all the coffee stories, because I realized how tiny the effect of coffee is compared to other things.

Trying to solve a tricky problem that I already know well (that is I don't have to read tons of background material first) keeps me very focused regardless of time of day. Same thing with some kinds of debates I have with people. Time of day only makes a difference when I'm not focused to begin with, and that difference is huge.

The other thing is that standing up and moving around is orders of magnitude more effective than any substance. It works instantly.