Not a pilot, but on one job in PNG, we did a lot of flying in Bell 47 helicopters. The night before one flight, I dreamed that we flew over the company admin. offices and crashed. Didn't worry too much, as our planned route didn't go near them, but on the next day's flight, because of low cloud, we were forced to fly right over them. I did have a slight twinge of anxiety that my dream may have been a premonition.