Zopiclone (brand name Imovane in Canada, Australia and Russia, brand name Zimovane in Europe). is a non-benzodiazepine hypnotic agent used in the treatment of insomnia. It is a cyclopyrrolone, which increases the normal transmission of the signal substance GABA in the central nervous system, as benzodiazepines do, but in a different way. As zopiclone is sedating it is marketed as a sleeping pill. It works by causing a depression or tranquilization of the central nervous system.