I think capturing ideas is lame. It delays thinking of more of them. The benefits of thinking to oneself come not from a single idea, but from the compounding effect of all of them. And you're not thinking of your next idea while you're wasting time capturing the last one.

It's better to let your mind wander to maximize the compounding effect between the ideas, rather than to fret about memorializing every vainly appealing thought (and btw, I bet if you did that while sober, it would look just as ridiculous when reading it the next day).

Just let it flow, man. You'll remember the good stuff.