Sleep tight, sweet princess...
Original Song by Ponyphonic
https://www.youtube.com/watch?v=H4tyvJJzSDk
Art used in video
https://www.deviantart.com/assasinmonkey/art/Commission-Sad-Celestia-346346258
Twitter
Twitter.com/ComicField
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https://www.deviantart.com/comicfield
Fimfiction
https://www.fimfiction.net/user/402263/Derpyfan1
Derpibooru
https://derpibooru.org/profiles/I%2BLike%2BDerpy