What does it mean to dream about lagoon?
A lagoon often pictures a sheltered pool of feeling held apart from the open sea, calm and enclosed, a place of stillness ringed by what is wilder beyond.
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 a calm enclosed water as feeling that has found a protected place, set apart from the open deep. The stillness may stand for safety or for something kept from the wider current.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung might see the lagoon as a sheltered bay of the unconscious, a quiet region held within reach of the vaster sea. Its calm can feel like refuge or like a place cut off, depending on the mood of the water.
Jungian concept (our summary).Modern
The continuity view ties a lagoon to waking wishes for calm and seclusion, or to a corner of life kept apart from the rush. What you felt in that still water tends to be the clearest clue.
Continuity hypothesis (our summary).Mythological
Sheltered waters and still pools appear in many myths as the haunt of nymphs and water spirits, places where the otherworld lay near. Their calm made them seem charmed, set apart from the open sea's reach.
Rosmerta Publishing editorial synthesis (after Bulfinch; Brewer).