Meanings
nounsleeplessness (usually uncountable, plural sleeplessnesses)
plural sleeplessnesses
- uncountableusuallyLack of sleep; the property of being sleepless; the inability to sleep, insomnia.
Synonyms: insomnolence · Antonyms: sleep, sleepiness, somnolence
Synonyms & antonyms
nounLack of sleep; the property of being sleepless; the inability to sleep, insomnia.
Similar
Opposite
More synonyms by meaning
nouna temporary state in which you are unable (or unwilling) to sleep
Similar
Broader
temporary state
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Cite this entry
APA
sleeplessness. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/sleeplessness
MLA
“sleeplessness.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sleeplessness. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “sleeplessness,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/sleeplessness.
Source: sleeplessness on Wiktionary, CC BY-SA 4.0.