Oh, I get both for sure. Roughly 15 minutes of speedy-go-fast, then I get sleepy (but not tired) an hour later, the ability to focus throughout lasting roughly 3-4hrs. Coffee does the same thing, but with a lot more sleepy (kinda tired) and less focus. I should mention I'm on Ritalin, which may explain the speedy-go-fast.

The main effect for me is a decrease in inexplicable mental barriers. Things that were hard suddenly aren't. Same brain, different output. I dunno man, I call that an increase in mental efficiency.

I love the action point metaphor. Much better than the spoons I've heard before.

How do you differentiate attention span and concentration?