agrypnotic

/ ˌæɡrɪpˈnɒtɪk /

adjective

1. obsolete,  inducing, relating to, or characterized by insomnia

noun

1. obsolete,  a drug or agent that induces insomnia

Word History and Origins

Origin of agrypnotic¹

C20: from Greek agrupnos wakeful, from agrein to pursue + hupnos sleep