Definition of "sleeping sickness" []

• An often fatal, endemic infectious disease of humans and animals in tropical Africa, caused by either of two trypanosomes (Trypanosoma rhodesiense or T. gambiense) transmitted by the tsetse fly and characterized by fever, severe headache, and lymph node swelling in the early stages, followed by extreme weakness, sleepiness, and deep coma. Also called African sleeping sickness. (noun)
• See encephalitis lethargica. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.