In psychology, incubation refers to the unconscious processing of problems, when they are set aside for a period of time, that may lead to insights. Wikipedia

The process of thinking about a problem subconsciously while being involved in other activities Wikipedia Disambiguation

in psychology, a process of unconscious recombination of thoughts previously stimulated through conscious work, resulting in novel ideas later (creativity) Wikidata

One of the four proposed stages of creativity (preparation, incubation, illumination, and verification): the unconscious recombination of thought elements that were stimulated through conscious work at one point in time, resulting in novel ideas at a later point. Wiktionary