Simpsons and Freudian Dream Theory

Repression

But this disagreeable sensation, which occurs also in dreams, does not preclude the existence of a wish ; everyone has wishes which he would not like to tell to others, which he does not want to admit even to himself. -The Interpretation of Dreams, p.135

Repression is part of the aim of the Dreamwork; it's what distortion, secondary revision, displacement, condensation, and symbols do.  Freud believes that everyone has feelings and desires that they aren't fully aware of.  These feelings are thus part of a person's unconscious mental and emotional life-- and they are that way for a reason.  Unconscious feelings and desires are usually things people would not like to admit about themselves.  Taboo sexual desires, violent urges, jealousy, a need for power or control, and a desire for death are all examples.  Although these may not be feelings we admit to ourselves, Freud believes that they can still govern our behavior, often in ways we don't even realize.  These desires are things that we repress; we don't admit them to ourselves and we come up with rationalizations for our behaviors that don't include the repressed thing.  In dreams, the repressed thing might surface in various ways as desires associated with it are fulfilled, while at the same time elements of the Dreamwork seek to suppress it and prevent it from causing distress.