The Dream Millennium: James White

Fleeing a polluted, over-populated and violent Earth, the starship drifted silently through the galaxies with its strange cargo - travellers frozen in a state of suspended animation until the computer-controlled ship should find a new home where they could fulfill their mission. But in the icy silence of the Cold Sleep, their peace was troubled by dreams - nightmares of such terrible power that they became a hideous reality, from which death would be a welcome release...