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apparently this is a thing, that when you sleep your brain repairs so you're able to make connections that you physically would not have been able to the day before.
I'm not sure you read andyp's comment properly. The gibberish recording at best shows that he was unable to express what he was thinking, at worst (and more likely, I'd say) that he only dreamed that he had a solution. Anecdotally, I know I've woken up from dreams where I'd solved a big problem, only to realise that not only was the solution not real, neither was the problem.
that when you sleep your brain repairs
"Apparently" is doing a fuck-tonne of heavy lifting, there.
Also, big lolz @dubtap meme.
Back in my coding days, I'd wake up in the middle of the night with a solution to a problem I was working on, so would leave myself a voicemail to explain it.
Every single time the voicemail made no sense whatsoever the following morning.