I've been experimenting with different ways of approaching new passages and how something so theoretically and musically, and even technically simple can feel so awkward and clumsy the first time you try to play, at least for those of us who don't carry 10 years of experience behind our back. Following Bernhard's advices I proved that the best approach is to take a slice small enough for your mind to be able to swallow and not choke on it, let your brain digest and process it during sleep and come back to it the next day. Which means further practice on that particular part on the same day won't make much progress - that, for me at least, is true; while if I don't touch it again and play it next day, it feels twenty times more natural and effortless.
So if basically the key is sleep, because it's when your mind arranges and organizes the memory, would it be effective if one has a normal practice, then a nap, and then start practicing again as if it was the next day?
I suppose the only way to know is to try it, but I get headaches and dizzy whenever i take naps, so I thought I'd ask people's opinion first.