I was checking out the forum on L. Ron Hubbard's Writers of the Future website (www.writersofthefuture.com) and found an excellent quote from author Kevin J. Anderson (one of my favorite writers who I got to meet at Shevacon in Roanoke, Va., this year).
He was on the forum June 24, 2008, to answer questions (since he is a contest judge), and answered this query: "What inspires you to write?"
His response was: "I write because if I didn't write, then my head would explode from all the ideas that keep coming."
OK, it's not a blow-your-mind kind of quote, but what I like so much about it is that it rings true with me and likely many other writers. Ideas and/or scenes pop into my head often, and I have to jot them down or I'll forget them. If they're for a chapter of a book, the ideas will keep pouring in until I complete the chapter.
And then ... the relief sets in ... too bad it doesn't last long. Almost immediately, I get more ideas for the next chapter. Save it for another day, I tell myself. Even writers need some sleep.