Brain Pickings reports on Neil Gaiman's thoughts about creativity:
For me, inspiration comes from a bunch of places: desperation, deadlines… A lot of times ideas will turn up when you’re doing something else. And, most of all, ideas come from confluence — they come from two things flowing together. They come, essentially, from daydreaming… . And I suspect that’s something every human being does. Writers tend to train themselves to notice when they’ve had an idea — it’s not that they have any more ideas or get inspired more than anything else; we just notice when it happens a little bit more.