[hatthew]

I experience similar, but I'm pretty sure it's just rest and a fresh mind, not overnight learning/thinking. When I'm bashing my head against a wall, I'm stuck in a local optimum, and sleeping lets me reset and try something new that often works better (and I execute it better since I'm not as tired).

[jmiskovic]

It's both. Sleep is when trained skill get delegated into the muscle memory. Not sure if it relates to dreaming.

https://en.wikipedia.org/wiki/Muscle_memory#Sleep_effects_on...