Now for the bit nobody will care about:
If the thought’s really worth it, I will get up, find a notebook, and spend quite a lot of time transcribing it. I’ve actually gotten pretty good at writing blind because a particularly pernicious thought keeps sleep from me at least once a month.
Every so often, I’ll read through my notebooks and try to synthesize these notes into something better. Often, the really good nuggets are lodged so deeply that I wind up remixing them durably within a few days anyway.
If I don’t record it, I’ll probably forget that I thought it soon enough, so I can only ever feel a few days’ worth of regret at any one time. And there’s still too much material to work on anyway.