Inspiration is volatile. If you don't write it down within seconds, the neural pathway often dissolves.
Inspiration is the result of "combinatorial creativity"—the brain taking two unrelated pieces of stored information and fusing them into a new, third thing. The "moment" is simply the conscious mind finally becoming aware of the work your subconscious has been doing for weeks. 2. The Incubation Paradox
Read outside your field. Talk to people who disagree with you.