The "bed" in the poem is a kind of furniture from Alakazam, that is, Xiongnu area, similar to our present benches. Poetry can be understood as Li Bai sitting on a small bench looking at the frosty moon in front of him, then looking up at the bright moon, and thinking of his hometown.
Landlord, look at the time, don't change everything at once. You see, I answer your questions late at night, and you have to give me any points.