Somnium
Somnium was originally a Latin word meaning "dream", and may refer to:

Somnium (novel), a scientific fantasy in Latin by Johannes Kepler
Somnium, a brand name for the drug lorazepam
Somnium (album) a 7-hour album by the ambient musician Robert Rich
Somnium, an album by SIANspheric
Teemu Raimoranta, nickname Somnium, a former guitarist from the bands Finntroll and Impaled Nazarene
Somnium (video game), also known as NesRom, a downloadable video game for the Nintendo DSi's DSiWare service
Somnium, a fictional card game from the Civilization IV: Beyond the Sword mod Fall From Heaven
Somnium, a short film made in 2017 which won three awards at different movie festivals. Made by a group called "Fiskekutter"
Somnium: A Dancer's Dream, a 2019 dance show directed by Neil Jones

See also
AI: The Somnium Files, an adventure video game