Among three different types of impactjul dreams (transcendent dreams, anxiety dreams, and existential dreams), existential dreams most frequently prompt reports of deepened self-perception (Kuiken & Sikora, 1993). To understand this effect, it is useful to consider three separate aspects of dream experience, each mediated by a different component of dream psychobiology. First, in impactjul dreams generally, narrative discontinuities mark mnemonic transformations that present progressively nonprototypic personal meanings. Second, in impactjul dreams generally, a heightened sense of "reality" emerges from accentuation of the dreamer's felt engagement in vividly present dream situations. Third, in existential dreams particularly, the disrnption of smooth engagement in dream actions initiates the realization of feelings that are tinged with sadness and that uproot superficiality. The interplay of these aspects of dream experience is required to understand how existential dreams deepen self-perception.