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English word sleepless comes from English -less (Lacking (something); without (something).), English sleep.

Sleepless etymology ?

Sleepless detailed word origin explanation

Dictionary entryLanguageDefinition
-less English (eng) Lacking (something); without (something).
sleep English (eng) (countable, informal) An act or instance of sleeping.. (uncountable) Rheum found in the corner of the eyes after waking, whether real or a figurative objectification of sleep (in the sense of reduced consciousness).. (uncountable) The state of reduced consciousness during which a human or animal rests in a daily rhythm.. A state of plants, usually at night, when their leaflets approach each [...]
sleepless English (eng) Characterized by an absence of sleep.

Words with the same origin as sleepless

Descendants of -less
breathless clueless countless defenseless fearless flawless hopeless meaningless merciless needless penniless pointless priceless regardless relentless ruthless selfless senseless thoughtless timeless toothless topless useless wireless