I wonder if that's a similar mental state you have while lucid dreaming or just after waking up. You feel like you have all of the answers and struggle to write them down before your brain wipes them out.

Reading it over once fully lucid? It's gibberish.

If we're talking about certain derivatives of ergot fungus ...

It's something I experienced as well, this sense of profound realisation of something important, life-changing maybe. And then the thought evaporates and (as you discovered) never really made sense anyway.

I think it's this that led people in the 60s to say things like how it was going to be a revolution, to change the world! And then they started communes and quickly realised that people are still people...

There's that Paul McCartney anecdote how he thought he'd found the meaning of life during one of his first drug experiences and the next morning he found a piece of paper on which he'd written "There are seven levels".