Read across the tradition as ease, play and safe passage, an animal that turns deep water from something threatening into something you can swim in.
People tend to wake from these dreams in a good mood, and interpreters have long noticed how consistent that is. The animal is associated with ease, playfulness and safe passage, and in the oldest layer of the tradition, which is Mediterranean and seafaring, dolphins were simply a friendly sign at sea rather than a symbol of anything inward. Two thousand years later the warmth of the association has barely shifted.
Sea dreams are usually interpreted through the state of the water, and this animal changes that state. Where a shark makes the identical ocean threatening, a dolphin makes it navigable, so deep water plus a friendly creature is generally treated as a picture of feelings that are large but no longer frightening. Swimming alongside one is the variant reported most; readers connect it with company through something you had braced yourself to face alone. A dolphin beached or penned reads the other way about, as ease that has run out of room.
It is worth knowing how recent most of the current meaning is. European dream books of earlier centuries mention dolphins only in passing, and the rich associations with healing, intelligence and joy grew up mainly over the last hundred years, through aquariums, television and popular writing. That does not make the reading useless. It does make it cultural rather than ancient, and saying so is simply honest.
A diver who swims with them regularly brings an association no general reading can improve on, and so does anyone whose only sight of one was in a tank and found it uncomfortable. Sleep reaches for whatever the animal already means to you. If your strongest memory of dolphins is a childhood holiday, that holiday is probably nearer the point than any symbol list.


