ˈslēplə̇s adjective
Etymology: Middle English sleples, from slep sleep + -les -less
1. : not able to sleep : insomniac
lay all that night sleepless and yearning to go home — W.M.Thackeray
2.
a. : affording no sleep
troubles, cares, and sleepless nights to him who wears the royal diadem — John Milton
b. : marked by absence of sleep
the sleepless sobriety of the drinker who has tried to go to sleep without drinks — Edmund Wilson
3. : unceasingly active
the sleepless ocean murmurs for all ears — William Wordsworth
deserves the attention of every American citizen and the sleepless concern of the responsible agencies of government — A.E.Stevenson b.1900
• sleep·less·ly adverb
• sleep·less·ness noun -es