Anecdotally, with caffeine I find it easier to do something concrete and relatively mindless, such as cleaning, or writing code that’s similar to something I’ve

Anecdotally, with caffeine I find it easier to do something concrete and relatively mindless, such as cleaning, or writing code that’s similar to something I’ve written before; but it’s much harder to figure out something novel or explain things to others. I wouldn’t be surprised if reduced blood flow turned out to be one cause of that effect.