Many years ago, my uncle was very ill with a premature aging disease similar to dementia. He used to go down the pub a couple of nights a week, and the local police often used to pick him up and stick him in the cells rather than let him wander around on his own late at night. One night he wandered into the next borough and the police there were not so accommodating. Once they'd established he was not drunk, they told him to go home, which he did. He got his keys out, opened the door, and went straight upstairs to the bedroom, whereupon he got into bed. The neighbours were soon woken up by screaming. He had gone to his old address, which a young couple had moved into, and still had the keys. The husband was away working, and his wife was in bed.....