If you dream of a peaceful lagoon you will have serene enjoyment in your domestic life.
If the lagoon is not inviting you will be cast into doubt and misuse your intelligence on mundane matters that do not require your attention while forgetting the important things.... Encyclopedia of Dreams
1- A lagoon or lake represents our inner world of feeling and fantasy. It is the unconscious side which is a rich source of power when it can be accessed and understood.
If the lake is contaminated we have taken in ideas and concepts which arc not necessarily good for us.
A clear stretch of water would indicate that we have clarified our fears and feelings about ourselves.
2- Often thought to be the home of the magical feminine and of monsters, the lagoon stands for the darker side of femininity. This is seen clearly in the legends of King Arthur and this type of image will appear in dreams as we lose our fear of that particular part of ourselves.
3- The unconscious and the primordial substance are often pictured as a lagoon.
The Chinese concept of a kind of soup from which came all existence, links with the lagoon.... Ten Thousand Dream Dictionary
Psychological / emotional perspective: Often thought to be the home of the magical feminine and of monsters, the lagoon stands for the darker side of femininity, and this is seen clearly in the legends of king arthur and those of the siren. This type of image will appear in dreams as we lose our fear of the depths of our own emotion.... Dream Meanings of Versatile
Gives gender - specific: Perhaps one of the reasons that a lake or lagoon is so enticing is because of its association with relaxation and ease. In both men’s and women’s dreams this quality will often come across albeit from slightly different perspectives; a stormy lake, for instance, may well signify a woman’s anger, whereas for a man it is likely to represent his partner’s distress. Also consult the entry for water.... Dream Meanings of Versatile
The inner world of our feelings and fantasies, the unconscious. Sinking into: becoming introverted; giving up on trying, or expressing oneself. Looking into depths: self awareness, looking into oneself. Dirty water difficult feelings; being unsure of oneself; depression. See water. ... A Guide to Dreams and Sleep Experiences