Her soft, ether-worldly glow keeps the nightmares at bay.
I actually started this before Sleepless in Ponyville(having only actually seen the episode last night), but it was never completed due to part of my tablet not working. Fixed it today and finished the picture with SiP in mind.
Full size is 4000x4535 pixels, resolution of 600 dpi, and it was drawn using Photoshop CS 5.5
EDIT: Spotted an error in the mane. Has now been fixed. :3
Luna and My Little Pony: Friendship is Magic is property of Hasbro and Lauren Faust.