This article explores the origin and role of Tsukiyomi-no-Mikoto, the moon god in Japanese mythology and culture. It explains that Tsukiyomi was born from Izanagi's left eye, believed to be responsible for controlling night-related aspects like dreams, sleep, death, fertility cycles, eclipses and tides. Other lesser known lunar deities associated with various aspects of life in Japan are also discussed. It is noted that although modernisation has caused certain customs or beliefs related to him to become less common than they once were, he still remains an important symbol for many people who appreciate its connection with nature & traditional values.