from The Century Dictionary.

  • noun Lack or deprivation of sleep; inability to sleep; morbid wakefulness, technically called insomnia.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The property of being sleepless.

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

  • noun a temporary state in which you are unable (or unwilling) to sleep


from Wiktionary, Creative Commons Attribution/Share-Alike License

sleepless +‎ -ness



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  • Strange how Weirdnet defines this in the second person.

    December 2, 2007

  • Does it? Are you sure WeirdNET isn't speaking only to you?

    December 2, 2007

  • This is a fabulous word. 5 s's, 4 e's, 13 letters, 5 distinct, and three syllables.

    October 28, 2008

  • In the same league: stresslessness and sleevelessness.

    October 28, 2008