The Emperor of Mars

"Out here, there’s a lot of ways to go crazy. Get cooped up in a passenger module not much larger than a trailer, and by the time you reach your destination you may have come to believe that the universe exists only within your own mind: it’s called solipsism syndrome, and I’ve seen it happen a couple of times. Share that same module with five or six guys who don’t get along very well, and after three months you’ll be sleeping with a knife taped to your thigh. Pull double-shifts during that time, with little chance to relax, and you’ll probably suffer from depression; couple this with vitamin deficiency due to a lousy diet, and you’re a candidate for chronic fatigue syndrome."