My grandfather had become quite ill, having suffered with Sleepy Sickness or Encephalitis lethargica
," he said.
Two adults progressed to encephalitis lethargica
(8), (14) and 4 children to acute necrotizing encephalopathy, (16), (19), (21), (22) while other reported cases presented with encephalomyelitis, (10) meningoencephalitis, (9) or pseudobulbar palsy,  with accompaniment of severe intracranial hypertension.
Having suffered nervous breakdowns, Peake began to display the symptoms of Parkinson's disease and a rare condition known as encephalitis lethargica
which impaired his ability to draw.
Crosby, an author and writer whose grandmother was killed by encephalitis lethargica
, or "sleeping sickness," examines the mysterious epidemic which killed about one million people around the world in the 1920s, mostly in New York City.
The neuroleptic drugs "induce a brain pathology, similar in kind to encephalitis lethargica
and Parkinson's disease.
After the encephalitis lethargica
pandemic from 1917 to 1926, depression, mania, and obsessive-compulsive disorder were observed in postencephalitis patients (11).
The doctors had diagnosed encephalitis lethargica
, popularly but inaccurately called ``sleeping illness'', the terrible condition which spread through North America and Europe with the Spanish influenza pandemic which killed 50 million people after World War One .