WordReference Random House Unabridged Dictionary of American English © 2017
sleepy sick′ness, [Brit. Pathol.]
  1. PathologySee  sleeping sickness. 

WordReference Random House Learner's Dictionary of American English © 2017
sleep•ing sick•ness /ˈslipɪŋ ˌsɪknɪs/USA pronunciation   n. [uncountable]
  1. Pathologyan infectious, usually fatal disease of Africa, characterized by great fatigue and a wasting away of the body:Sleeping sickness is carried to the body through the tsetse fly.
  2. Pathologya viral disease affecting the brain, characterized by sleepiness, muscular weakness, and difficulty in seeing.

WordReference Random House Unabridged Dictionary of American English © 2017
sleeping sick′ness, [Pathol.]
  1. PathologyAlso called  African sleeping sickness, African trypanosomiasis. a generally fatal disease, common in parts of Africa, characterized by fever, wasting, and progressive lethargy: caused by a parasitic protozoan, Trypanosoma gambiense or T. rhodesiense, that is carried by a tsetse fly, Glossina palpalis.
  2. PathologyAlso called  epidemic encephalitis, lethargic encephalitis. a viral disease affecting the brain, characterized by apathy, sleepiness, extreme muscular weakness, and impairment of vision.
Also,[Brit.,] sleepy sickness. 
  • 1870–75

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