I am wide awake and my wheels are spinning. I wish I could start writing now!
Assuming you have the basic story idea, characters, settings, and such in place, what's stopping you from doing a prequel now? Maybe a related short story with some of the characters before the events of your main story?
I'm debating doing nano this year. Something always comes up whenever I do this, and this year's isn't looking so hot - three-day convention, book signings, Thanksgiving and Black Friday, book club, convention planning meetings - but maybe if I double up a few days, I could make it this time.
The problem is narrowing down which story to write ... I have two main story ideas, and combining them won't work.
Good luck everyone who is participating!