Creativity is a virus. It duplicates and grows until it consumes my entire life. I can't speak for every writer, but my insomniatic mind has spun for hours playing out possible scenes for projects that I am working. The heart of creativity lies in creating and to create, most people start with an idea.
Once you have your audition recorded, you might notice a decent amount of background noise especially if you use a compression mic. If you can easily notice cars outside, horns blaring, or maybe the tv from downstairs, you will likely need to try again when it is more quiet.