from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The property of being sleepless.

from The Century Dictionary and Cyclopedia

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

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

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


sleepless +‎ -ness (Wiktionary)


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