It is thought that over 100,000 people in Britain alone suffer from Charles Bonnet Syndrome, a condition that causes hallucinations which can lead sufferers to believe that they've lost their minds.

"Following his wife's death six years ago, David Stannard has become accustomed to spending quiet evenings alone at his home in Walton-on-Thames, Surrey. So it came as a surprise to the 73-year-old when he looked up from his television one evening to discover he was sharing his living room with two RAF pilots and a schoolboy. "  Full Article