Article 1 Z drugs 1 adult 1 aged 1 attention 1 benzodiazepines 1 case control study 1 chronic insomnia clinical feature 1 clonazepam 1 cognition 1 cognitive defect 1 cognitive impairment 1 controlled study 1 demography 1 depth perception 1 diazepam 1 disease assessment 1 disease severity 1 drug dependence 1 drug effect 1 drug exposure 1 drug safety 1 drug tolerance 1 drug use 1 elderly 1 estazolam 1 executive function 1 female 1 groups by age 1