Томский политехнический университет
Other than excessive sleep, the disease causes vomiting, hallucination, nausea and disorientation. Victims of the disease often feel hallucinations like a "snail walking over their face". In a statement, a professor from Tomsk Polytechnic University, Leonid Rikhvanov, of the department of Geo-ecology and Geo-chemistry said that radon gas from the mine could be the cause of the symptoms.