Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Marked by a lack of sleep: a sleepless night.
  • adj. Unable to sleep.
  • adj. Always alert or active; never resting: a sleepless district of the city.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Characterized by an absence of sleep.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having no sleep; wakeful.
  • adj. Having no rest; perpetually agitated.

from The Century Dictionary and Cyclopedia

  • Being without sleep; wakeful.
  • Constantly watchful; vigilant: as, the sleepless eye of justice.
  • Restless; continually disturbed or agitated.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. always watchful
  • adj. experiencing or accompanied by sleeplessness

Etymologies

sleep +‎ -less (Wiktionary)

Examples

  • Certainly Aftermath took its toll in sleepless nights.

    A Conversation with Peter Robinson

  • Likewise, standing shackled and sleepless is not torture if the duration is short, but it is torture when the duration is 180 hours.

    The Volokh Conspiracy » More on Liz Cheney

  • But in so many married women sleeplessness and a consequent nervous condition are coupled with a lack of the complete sex relation, that one of the first questions a physician should put to those of his women patients who are worn and sleepless is whether her husband really fulfills his marital duty in their physical relation.

    Married Love: or, Love in Marriage

  • At the moment she had felt that his casual words held a hidden meaning, and to this day, though she had pondered them in sleepless nights ever since, she was still undecided.

    The Miller of Old Church

  • I was a little shaver, but recall the sleepless nights my parents never slept, worring about loosing our home and farm.

    Some Political Notes

  • Sir Sydney still recalls sleepless nights spent thinking about minor details of construction or possible unsuspected weaknesses which might prove fatal to his airplane in the moment of com - bat or strains.

    The HurricaneStory

  • When I recall the sleepless care with which Mrs. Stevenson watched over him at that critical point in his life, it seems to me that it is not too much to say that the world owes it to her that he lived to produce his best works.

    The Life of Mrs. Robert Louis Stevenson

  • Not, indeed, that the loss of sleep troubles me, for if any one could claim to be called the sleepless one, it would be I-- that is to say, when engaged in these arduous explorations, and curtained by night and the stars; but, although I can do without sleep, I require a certain amount of horizontal repose, and this I could not obtain in this fearful glen.

    Australia Twice Traversed, Illustrated,

  • Habibion recalls the sleepless nights on tour back in the 1990s with his old band Edsel, when Obits frontman Rick Froberg's former group, post-punk favorites Drive Like Jehu, would be playing in the background.

    AltWeeklies.com Site Feed

  • "It can kill," he admitted, recalling the sleepless nights, marathon meetings and hectic travel schedules.

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