noun[mass noun] British
- Encephalitis lethargica, a brain infection causing drowsiness and sometimes coma. See also sleeping sickness.More example sentences
- Lieberman suggests that he caught encephalitis when in military hospital in 1918, the time of the worldwide ‘sleepy sickness ' epidemic.
- It may result in sleepy sickness and will decrease colostrum/milk production.
- African sleepy sickness is still loose in some parts of Africa.