Health Encephalitis Lethargica Mystery: 100-Year-Old Sleep Pandemic Still Unsolved by Health Editor — Dr. Nadia Rowe June 7, 2026 by Health Editor — Dr. Nadia Rowe June 7, 2026 Between 1917 and 1930, an enigmatic neurological pandemic known as encephalitis lethargica, or “sleeping sickness,” afflicted millions globally, leaving … 0 FacebookTwitterPinterestEmail