The Idea of Paradise

Being a princess carries with it untold responsibilities. And when Twilight begins dreaming about a place where she doesn't have to be responsible for anyone, curiosity wins over and she begins to search for it. She's not the only one.

Twilight doesn't know why she's starting to feel weighed down by her responsibilities. She's always been able to manage everything well, or well enough.

Or maybe she's just been pushing it down like Celestia and Luna have.