Even though she may help ponies in their dreams and their nightmares, doesn't mean she doesn't have nightmares herself. Luna actually has nightmares constantly that she may be abandoned by her sister sooner or later. Luna confesses these fears to the only pony who will listen, her sister's faithful student, Twilight Sparkle.

Art by Ellen124

For Luna is Best Pone Contest
Subject: Even Luna (The Princess of the Night) has Nightmares