Brilliant Idea

Last night before going to sleep I had this brilliant idea! And then I fell asleep. Since then, I do not remember the brilliant idea. They say if something is really important, it comes back to your mind. Well, this idea is still out there. Maybe it was brilliant but not so important? It would be cool to have a camera to take pictures of ideas. Then you just click and and save it and dial back to it any time you feel like it. Now writing the idea down is sometimes more difficult, as it normally has a context which can be rather time consuming to capture in words. That is why my idea escaped and may never come back to me.
But I have also noticed, that some of my ideas of which I think are really innovative and creative have already been thought of by someone else and there is an entire website, library, etc. written about it. But to me the ideas seem so great - only until I discover that I am not the original author of them...