Poseidon / Neptune dream meaning is explained below using 1 different source. Each interpretation is shown with its source.
Interpretation 1 — Theresa Cheung
Poseidon was the explosive and unpredictable god of the seas.
If he or other creatures of the sea appears in dreams, his stormy nature may point to great changes—or the need for you to make great changes—in your waking life.
Source: The Element Encyclopedia • Author: Theresa Cheung