The use of 7-chloro-3-(5-dimethylaminomethyl-[1,2,4]oxadiazol-3-yl)-5methyl 4,5-dihydro-imidazol[1,5,-a][1,4]benzodiazepine-6-one or its pharmaceutically acceptable salt for treating various types of insomnia.Linvention porte sur lutilisation de la 7-chloro-3-(5-diméthylaminométhyl-[1,2,4]oxadiazol-3-yl)-5méthyl 4,5-dihydro-imidazol[1,5-a][1,4]benzodiazépine-6-one ou de son sel pharmaceutiquement acceptable pour traiter divers types dinsomnie.