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. Maxi Jazz changed the opening line from "I only smoke weed when I need to" to "Deep in the bosom of the gentle night" due to pressure from MTV. It also contains some bells chiming at the start of the song (sampled from a BBC Sound Archive disc) not generally known by the club-going public as many people know the Monster Mix or the Monster Mix Radio Edit. The beginning of the album version of the song also features a sample from Biosphere's "Novelty Waves" (1994). The Monster Mix was the mix featured on Faithless' greatest hits album Forever Faithless, with the original edit being the work of Radio Victory's Bill Padley. This edit was picked up by BBC Radio 1 and became a small UK Top 40 hit, with the Cheeky label's recording being licensed through Champion Records at the time. After the song gained popularity in continental Europe, Pete Tong campaigned for a re-release: Cheeky/Champion chose to hold back the re-issue so it arrived in shops on the same day as the Spice Girls' "Say You'll Be There", so it would be placed in racks alongside it. The song went on to top the U.S. Hot Dance Club Play chart. The Moody Mix featured on some of the singles was also on the Reverence / Irreverence release.
"Insomnia" was re-mixed and re-released in 2005 after the re-entry of the 1996 single into the UK Singles Chart at number 48. This was partly because of Faithless releasing their greatest hits album. The re-mix was not used on the greatest hits with the Monster Mix being the version which featured on the album. The re-mixed version reached number 17 on the UK Singles Chart. 2b1af7f3a8