Over years of math undergrad and grad school I tried very hard and was never able to get this to work, so you're not alone. I was able to reliably reproduce hopeful feelings after sleep, but upon investigation the "new leads" were either things I had already tried (and forgotten why they didn't work) or they were the type of imprecise high-level vague direction ideas that were never difficult to generate and still had 99% of the true effort remaining to grind through the details.