
Stuff You Should Know The Mystery of the Sleepy Sickness
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Oct 2, 2025 Travel back to the early 1900s and explore the enigmatic sleepy sickness, a pandemic that left patients in a deep, semi-aware state. Discover the peculiar symptoms, including hypersomnolence and catatonia, and the exploration of the illness by Dr. Constantin von Economo. Learn about the chilling connection between the outbreak and long-term Parkinsonism, as well as Oliver Sacks' groundbreaking work on revival treatments. Delve into the mysterious disappearance of the disease and current theories regarding its origins!
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Three Acute EL Subtypes
- Von Economo divided acute EL into somnolent, hyperkinetic, and amyostatic-akinetic forms with distinct dominant features.
- Each form matched different neurological syndromes, explaining EL's symptom diversity.
Extreme Psychosis Case Report
- A disturbing case from the 1930s described a girl who gouged out her eyes during a psychotic episode.
- Such extreme reports illustrated the severe neuropsychiatric damage EL could cause.
Chronic EL As Post‑Encephalitic Parkinsonism
- Chronic EL often presented as post-encephalitic Parkinsonism years after acute illness.
- Patients could become statue-like with waxy flexibility and long-term akinesia.






