"Insomnia" is a song recorded by British dance group Faithless. Released as the band's second single, it became one of their most successful. It was released in 1995 and became a hit in Dance Charts while peaking at number 27 in the UK in 1995 and number three in 1996. It re-entered the UK charts in 2005 at number 17 after the release of their greatest hits compilation Forever Faithless and was certified Platinum by the BPI in 2015. It was voted by Mixmag readers as the fifth greatest dance record of all time. The main refrain of "Insomnia" is a heavy sample of 1989' "Let Me Love You for Tonight" by UK artist Kariya.

The song features Maxi Jazz singing as an insomniac while he struggles to sleep ("I toss and I turn without cease, like a curse, open my eyes and rise like yeast/At least a couple of weeks since I last slept, kept takin' sleepers, but now I keep myself pepped"). The subject is resonant with fans of dance music, as stimulant use is common in club/rave culture, and insomnia is a common side effect. The insomniac is also rather destitute ("Make my way to the refrigerator/One dry potato inside, no lie, not even bread, jam, when the light above my head went bam..."). This song uses the Roland D-50 custom patch "Stable Master" for its main riff.

The album version is nearly nine minutes long and contains some lyrics not able to be broadcast on the radio edit due to their explicit content. It also contains some bells chiming at the start of the song not generally known by the club-going public as many people know the Monster Mix or the Monster Mix Radio Edit. The Monster Mix was the mix featured on Faithless' greatest hits album Forever Faithless. The song topped the U.S. Hot Dance Club Play chart. The Moody Mix featured on some of the singles was also on the Reverence / Irreverence release.

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