agrypnotic

== English == === Etymology === From the Greek word άγρυπνος (ágrypnos) meaning sleepless. === Adjective === agrypnotic (comparative more agrypnotic, superlative most agrypnotic) (medicine) Preventing sleep; causing wakefulness; insomniac. === Noun === agrypnotic (plural agrypnotics) (medicine) A medication that prevents sleep.