Winston's dream in Chapter 3 is used as a means of reveling background information. It is through the dream we learn about Winston's mother and sister and about what he knows about how he came to lose them. We learn that he has been on his own, then, since he was ten or eleven. We also learn that he recognizes the facial characteristics of the expression of love; he sees this expression of love on his mother's face in this dream. His psychological character is being revealed as part of this background.