"A Russian man trying to sleep off a night of after-work drinking failed to notice a six-inch (15-cm) knife in his back - until his wife woke him up.
Mr Lyalin, an electrician, had spent the evening drinking with a watchman at his workplace when they got into an argument, Interfax news agency reports.
His alleged attacker reported the crime to the police himself, Interfax adds. Mr Lyalin apparently feels fine and bears no ill-will.
"We were drinking and what doesn't happen when you're drunk?" he was quoted by Komsomolskaya Pravda as saying."