He showered, and for once climbed very early into bed, feeling that he must have nightmares. About strange sounds in the winds, over the mysterious thickets of Mars. Or about some blackened, dried-out body of a sentient being, sixty million years dead, floating free in the Asteroid Belt. A few had been found. Some were in museums.
(From...maybe The Planet Strappers by Raymond Z. Gallun? I need to keep better notes.)