I have the same issue, I can even say that I daydream 100% of the time, it doesn't stop even when I do things that requires concentration. When it does stop for a while,

I want to find a way to use it to my advantage instead of it slowing me down, to bring the characters from the dream to my real life. It's OK that they are imaginary characters, I just want them to live here with me rather than me living there with them...