In the second half of the 1980s, zopiclone was one of the first "Z drugs" used to treat insomnia. These drugs were created as a safer alternative to benzodiazepines, which are highly addictive and can lead to dependence if used long enough. Zopiclone was the first drug to be developed that has a chemical structure different from benzodiazepines but acts on the same cell receptors. Zopiclone...