Imagine that I make a post in which I propose a new theory or idea, but I don't write any paper about it. Then, some years later, a researcher independently and completely unaware of my post, proposes the same theory/idea in a peer-reviewed paper.
In what circumstances could I claim co-authorship of that theory/idea and how could I handle that?
EDIT: As suggested, I rephrased this question. I kept the original question below, for future reference. The context of how this question arose was maybe idiotic, and that was making the answers to drift away from a general view of the problem. As I said in the comments, I was not realistically considering to claim any authorship for the idea or act on it in any way - it is a genuine curiosity of how things could be handled in a generic way. At least, I'm glad to see that this community can engage in a controversial question like this without being disrespectful (no sarcasm).
Some years ago I made this question which was closed soon after.
I was basically suggesting that sleeping could be an evolution advantage as they allow dreams to happen, which in turn allow you to simulate different situations in a safe environment, thus being more well prepared to react in new situations in real life.
Recently, a researcher proposed the same (similar?) idea.
Now, I honestly don't think he stole the idea from my post. It's perfectly reasonable that someone in this field could come to the same hypothesis. However, I am creature with an ego bigger than one could consider healthy, and this feeling of "I also had that idea before, and I think I deserve some acknowledgment for that" is lurking on the back of my head. I'm sure that with it will go away, but what I would like to ask here is: do I have any reason/right to claim co-authorship of such theory?
I know that history of science has many cases of independent researchers doing the same discover, and I'm sure all around the world there are people who already experienced this "ah! but I had that idea before!". So, even though this really doesn't matter and it's just food to the ego, I am curious to know how this type of situations can be handled.