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Zopiclone, (brand name Imovane in Canada, and Zimovane in the UK) is a non-benzodiazepine hypnotic agent used in the treatment of insomnia. Zopiclone is known colloquially as a "Z-drug". Other Z-drugs include zaleplon (Sonata) and zolpidem (Ambien and AmbienCR) and were initially thought to be less addictive and/or habit-forming than benzodiazepines. However, this appraisal has shifted somewhat in the last few years as cases of addiction and habituation have been presented. It is recommended that zopiclone be taken on an "as needed" basis. Daily or continuous use of the drug is not usually advised. While it acts on the same benzodiazepine receptors as the benzodiazepine family of drugs it is not classed as a benzodiazepine (with which it shares a number of characteristics and effects) due to its differing molecular structure. Zopiclone is classed as a cyclopyrrolone derivative.