Yep. There's probably a function that describes this. Since I started experimenting in games development and design, I've learned that ideas are like a daily crossword puzzle (or a similar analogy).

Start small.

You can write it down.

You don't have to finish it (now).

You should probably throw it away after a week.

Over time, you're more likely to find a different permutation of ideas that you had not considered before.

Other analagous platitudes.