Guilty men, more than those who aren't guilty, want others to share their misery. Guilty persons generally prefer darkness or nighttime. Typically, the guilty prisoners live in darkened cells even where they could be lighted. Often the cells are shrouded to prevent almost all light from entering. During sleep, the guilty sometimes cover their heads.
Most guilty prisoners express their dread of light by favoring the nighttime.
Before their imprisonment, they tended to follow the same inverted schedule in the free world. This bizarre trait is part of the guilty man's instinct to hide and to conceal himself. To the guilty morality is based upon strength and the willingness to use force to compel conformity and agreement. For the guilty, the rule is not by laws, but by power. In the same way, guards and prison administrators, control prisoners not by rules, but by intimidation and fear.