Talk:Princess Luna/@comment-26973802-20121028034047

I heard there are many theories about Nightmare Moon being an embodiment of Luna's jealousy and bitterness that is possessing her. Interesting enough Lauren Faust said "Luna was no longer present, jealousy buried her inside Nightmare Moon". (In the same comment about explaining Nightmare Moon's banishment)

And there's another theory that King Sombra had something to do with her transformation, since she became Nightmare Moon a thousand years ago, and the Crystal Kingdom disappeared for a thousand years. Maybe he took advantage and magnified her bitterness...

What are everypony's thoughts on these two theories?