"Insomnia" is a song by British musical group Faithless. Released as the band's second single, it became one of their most successful. It was originally released in 1995 and reached number 27 on the UK Singles Chart, topping the UK Dance Chart in the process. When re-released in October 1996, the song achieved a new peak of number three in the United Kingdom and topped the charts of Finland, Norway, and Switzerland, as well as the American and Canadian dance charts. It also featured on Faithless's 1996 debut album, Reverence.