From Mr. Wiki:
Incubation is one of the four proposed stages of
creativity, which are preparation, incubation, illumination, and verification.
[1] Incubation is defined as a process of
unconscious recombination of
thought elements that were stimulated through
conscious work at one point in time, resulting in novel
Invalid Link Removed at some later point in time.
[2] Incubation is related to
intuition and
insight in that it is the unconscious part of a process whereby an intuition may become validated as an insight. Incubation substantially increases the odds of solving a problem, and benefits from long incubation periods with low cognitive workloads.
[3]
The experience of leaving a problem for a period of time and then finding that the difficulty evaporates on returning to the problem, or, even more striking, that the solution "comes out of the blue" when thinking about something else, is widespread. Many guides to effective thinking and problem solving advise the reader to set problems aside for a time.