Japan dream meaning is explained below using 3 different sources. Each interpretation is shown with its source.

Interpretation 1 — Theresa Cheung

An archipelago in the Pacific, Japan is separated from the east coast of Asia by the Sea of Japan. Japan’s four main islands are Honshu, Hokkaido, Kyushu, and Shikoku. In dreams, it may indicate spiritual tranquility or the need for it in waking life.
Source: The Element Encyclopedia Author: Theresa Cheung

Interpretation 2 — Katherine Taylor Craig

A dream of ill-luck (Gypsy); symbolism probably based upon Japanese inhospitality to foreigners in former days.
Source: The Fabric of Dream Author: Katherine Taylor Craig

Interpretation 3 — Stearn Robinson - Tom Corbett

See Foreign,
Source: The Complete Guide to Interpreting Your Dreams Author: Stearn Robinson - Tom Corbett