Dependence & withdrawal symptoms eg, rebound insomnia or irritability. Psychiatric symptoms & disturbances of consciousness (eg, delirium, confusion, somnambulism, hallucinations, excitation, disinhibition, depressed level of consciousness) may occur. Transient anterograde amnesia & twilight states. Resp depression; carbon dioxide narcosis. Hepatic function disorder & jaundice accompanied by increased AST, ALT, γ-GTP & Al-P may occur.