"Insomnia" is a song recorded 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 1996, the song reached a new peak of number three in the United Kingdom and peaked atop the charts of Finland, Norway and Switzerland, while becoming a top-five hit in several other countries and topping multiple dance charts. It was certified Platinum by the British Phonographic Industry (BPI) in 2015.
"Insomnia" was voted by Mixmag readers as the fifth greatest dance record of all time. The main refrain of "Insomnia" is a drum sample of "Let Me Love You for Tonight" by artist Kariya.