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- “The title of this song, played during the trailer for FF Versus XIII, means 'sleep,' but there is nothing restful about the forceful vocals singing of coming war.”
- —Theatrhythm Final Fantasy description
"Somnus" is the main theme for Final Fantasy XV. The song first appeared in the first trailer for the game. It was included on the album Drammatica by Yoko Shimomura, the composer for the Kingdom Hearts series and Legend of Mana.
Somnus is a DLC Field Music Sequence song for Theatrhythm Final Fantasy, and the background featured is of a large city, similar to the one seen in several trailers for the game. It is the only song out of the 52 DLC tracks that doesn't appear for the iOS version, and the only song not to return in the sequel, Theatrhythm Final Fantasy: Curtain Call.
Somnus is the Latin word for "sleep", and the personification of sleep (also called "Hypnos"). This is a possible reference to the game logo, which is an image of a sleeping woman.