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The longest lethargic sleep incident is mentioned in the Guinness Book of Records. It happened to Nadezhda Lebedina (born in 1920 in Russia's Dnepropetrovsk region). The woman had a very big argument with her husband in 1954 and fell asleep because of the stress for 20 years. Nadezhda recovered only in 1974: doctors concluded that she was an absolutely healthy individual.
A stockman, named only as Granatkin, from a district food base in one of Russia's towns, had to have a similar, albeit a more horrible experience in his life. A man named Mechnik attempted to kill the stockman: he hit him on the head, took the body to the forest and buried it under the snow. Lumber-men incidentally uncovered the frozen body and took it to the morgue. A local pathologist refused to do the autopsy - the body was too hard. The next day the pathologist said that the man's eye pupils did not look like dead. Furthermore, the man's nails turned pink after the doctor pressed them in his fingers. The man spent 22 days lying under a thick layer of snow, but it appeared that he was still alive. The pathologist diagnosed a deep lethargic sleep, which had been caused with a blow on the head. To everyone's great astonishment, stockman Granatkin came to his senses and recovered. He was lucky to wear very warm clothes on the day of his murder; the snow saved him from severe frost too.
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http://english.pravda.ru/science/19/94/378/14212_time.html