The Full Moon was in Sagittarius. The Sun in the opposing sign, Gemini, was in conjunction with retrograding Mercury and 148780 Altjira, a classical Kuiper belt object which was discovered in 2001.
Classical trans-Neptunian objects are given mythological names associated with creation. 148780 Altjira was named after the sky god of the aboriginal people of Australia. Altjira was the central god of the Dreamtime, a sacred era which existed before the life of the individual began, and continues to exist when the life of the individual ends. In the beginning Altjira created the Earth and gave the humans everything they might need. Then without leaving instructions he retired to the sky.
When we are trying to establish the astrological meaning of a new planet, leaning solely on its mythological name may not be the best policy. However, my research a couple of years ago indicated, that Altjira has something to do with sleep and dreaming.
The Roman god Mercury is equivalent to Greek Hermes, the messenger of the gods. Among other things, Hermes was a god of transitions and boundaries. He was a guide to the underworld, and he was able to move between the worlds of the living and the dead. He is said to have the power to enter the dreams of mortals. We can also consider him as a messenger between the conscious and unconscious parts of the mind.
The Moon in Sagittarius and the conjunction of planets in Gemini are square to Neptune in Pisces. Neptune is associated with dreams and denial, among other things. The square aspect creates tension; it challenges you to face issues.
Retrograding Mercury in conjunction with Altjira and square to Neptune suggests that your dreams may reveal to you something about yourself, which so far has remained unnoticed or hidden. Keeping a dream diary now could be a good idea.