There are multiple artists named Insomnia: 1) Insomnia is an influential Norwegian improvisation group originally formed by Arild Kristoffersen in 1981. They have moved from variations of psychedelic rock to free jazz and noise and still perform regularly. Today, still very close to its original line-up, the group consists of Knut Erik Sandli, Øyvind Hellner, Espen Ursin Oddvar Karlsmyr, Terje Lerstad (who has written music for the BBC orchestra among others), Sergi Massó, and Øystein Sandsdalen out of Le Corbeau and Serena Maneesh.