Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to sleepy sickness: encephalitis lethargica
Switch to new thesaurus
|Noun||1.||sleepy sickness - an encephalitis that was epidemic between 1915 and 1926; symptoms include paralysis of the extrinsic eye muscle and extreme muscular weakness|
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.