What does it mean to dream about happiness?
Happiness in a dream often reflects contentment or relief, and it can be worth noticing what in the dream, or in waking life, the good feeling is attached to.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read happiness in a dream as a wish being fulfilled, the mind granting itself something it wants. He held that pleasant dreams often show desire satisfied in disguise. The feeling can mark a longing met, if only in sleep.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung would see deep contentment as a sign of the self in balance, the parts of the psyche briefly at ease with one another. He valued such feeling as more than a mood, a glimpse of wholeness. It can mark a movement toward what feels whole and true.
Jungian concept (our summary).Modern
Continuity research ties happy dreams to waking well-being and the bonds and successes we carry in mind. Some accounts suggest positive dreaming reinforces what feels rewarding by night as well as by day. The feeling is worth weighing against what is going well for you.
Continuity hypothesis (our summary).Mythological
Myth set joy in the golden age and in the blessed fields where the worthy dead rested, places of ease beyond ordinary life. Festivals to Dionysus turned shared happiness into something sacred. The feeling was often pictured as a gift from above, never wholly our own making.
Rosmerta Publishing editorial synthesis (after Bulfinch; Frazer).