Dreams and magic have always shared a close bond, with one being able to affect the other. But Twilight Sparkle sees no reason to delve into the uncertain territory of dream or sleep-related magic, for it holds no interest for her. Yet one night, while Twilight slumbers, the astral plane opens before her. She is taken on a journey outside of her body, a journey of discovery and knowledge that cannot be found in any book.
Note: This one-shot was inspired by "Astral Plane", a recent episode of the Cartoon Network animated show Adventure Time
Technically a slice of life fan fiction as well, but for some reason I can't put it under both "Adventure" and "Slice of Life".