zopiclone is like a benzo in hypnotic and amnesia effects, but has weak anti-anxiety and muscle relaxant effects. it belongs in a class of sedatives known as the "z-drugs". they are ment to be used only as hypnotics, and are similar to benzos in that matter as they both effect that specific area of the GABA-a receptors, but the z-drugs are more "selective" and were developed to have less abuse and dependence potiential as benzos. other "z-drugs" include ambien and lunesta.
even though the z-drugs affect some of the same receptors as benzos, they can have very different effects. they are usually very short acting can have unusual side effects including hallucinations, bizzare behavior, and amnesia. they can cause euphoria, but they can also be dysphoric in some.
some find them recreational for the hallucinations and possible euphoria, but most people prefer benzos.