Middle of the night brainstorms

So I send off my latest excerpt to my critique group. It's the next part of a novel where I'm not totally happy about the beginning. (I like the chapter but felt it didn't need to be at the beginning since I was using the events of the future and then flashing back to the past for the rest of the novel.) Well...that night I had a dream. A dream where little...no, not that dream. I realized I needed to go into the past. (Seventy-four years in the past to be exact) Into the past to a birthday party and a birthday wish. THEN I realized that the little girl in that birthday party (who is the MC's deceased great-grandmother) needs to play a more prominent role as her grown-up ghost haunts the MC! WOW! Now I'm totally revamping that beginning but not scraping what I've sent out. Why couldn't this brainstorm happen the night BEFORE I sent out the excerpt? Then the new ideas could have been critiqued! Oh, well. I'm thankful for brainstorms anytime they occur.