An idea is only as strong as its execution. People have been writing books for a very, very long time, and I would say that practically everything that can be conceived by human beings has already been done. Add to that the fact that it's not only a case of everything having been done already, but also of everything having been reworked, revamped and redone again, then each and every possible combination of any two or three or ten or twelve concepts has also been done. And people have been dreaming for a lot longer than they've been writing books. Can dreams be a good source of inspiration? Sure, why not? Is it likely that anyone might have a dream that's so strikingly original and inconceivably revolutionary that it would inherently form the basis for an integral and groundbreaking work? No. Because all ideas need to be fleshed out, brought to life, coaxed into existence. And doing that well is a very different thing from cooking up some premise.