köken: From 寝(ね) (ne, “sleep”) + 不(ふ)足(そく) (fusoku, “insufficient”). The fusoku changes to busoku as an instance of rendaku (連濁). First attested in 1909.
sleepless, lacking sleep, unable to fall asleep (of a night or a person)
çekim: karşılaştırma sömnlösare · üstünlük sömnlösast
köken: sömn + -lös first observed in 1635. A noun sömnlösa (“sleeplessness”) was first used in 1623. The more common noun sömnlöshet (“sleeplessness”) was first used in 1681.
köken: Etymology tree Latin somnus Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in- Latin -is Latin in- -is Latin īnsomnis From somnus (“sleep”) + in- -is.
köken: Etymology tree Latin sineder. Esperanto sen Esperanto sen- Esperanto dormi Esperanto -a Esperanto sendorma From sen- (“without, -less”) + dormi (“to sleep”) + -a (adjectival ending).