Three short lines carry a small, quiet surprise. The speaker opens by saying that both people had a beautiful dream the same night, which sounds like a shared moment. Then the lines split the two dreams apart. The other person saw golden stars and a shining moon, a picture straight out of a fairy tale. The speaker's dream was simpler: "I dreamt about you."
That plain last line is where the feeling lands. After all the glittering images, the speaker doesn't need anything grand. The person is enough, and the poem quietly suggests they were more beautiful than any stars. It also hints at a gentle imbalance: the speaker appears in the other person's thoughts less clearly than the other person appears in theirs, though the poem never says so outright.
The mood is soft, tender, and a little shy. The short length and simple words make it feel like a confession whispered rather than announced.