sleepy sickness

noun

An acute inflammation of the brain which causes drowsiness and mental disease.

Similar
encephalitis lethargicavon Economo diseasesleeping sicknessepidemic encephalitislethargic encephalitis
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Meanings

nounsleepy sickness (uncountable)
  1. uncountableAn acute inflammation of the brain which causes drowsiness and mental disease.

    Synonyms: encephalitis lethargica, von Economo disease

Synonyms & antonyms

nounAn acute inflammation of the brain which causes drowsiness and mental disease.

Similar
encephalitis lethargicavon Economo disease

More synonyms by meaning

nounan encephalitis that was epidemic between 1915 and 1926; symptoms include paralysis of the extrinsic eye muscle and extreme muscular weakness

Similar
sleeping sicknessepidemic encephalitislethargic encephalitisencephalitis lethargica
Broader
encephalitiscephalitisphrenitis
Also see
encephalitis lethargicasleeping sickness

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

sleepy sickness. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/sleepy%20sickness

MLA

“sleepy sickness.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sleepy%20sickness. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “sleepy sickness,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/sleepy%20sickness.

Source: sleepy sickness on Wiktionary, CC BY-SA 4.0.