What does this ancient poem of Bai Juyi mean in Ye Xue?

This night, the pillow was ice, which surprised me. I saw the light snow outside the window.

It's late at night until it snows heavily, because you can hear the sound of bamboo branches breaking from time to time.

Appreciating Bai Juyi also wrote many poems related to snow. The Night Snow is just one of them, but its length is short, but it is intriguing, euphemistic and winding.

"I'm so scared that my pillow is cold and my window is bright." Most of Bai Juyi's poems are easy to understand, and this poem is no exception. When I fell asleep, I felt that the thick quilt could not resist the invasion of cold, and even woke up with cold. I'm surprised. What happened tonight? Suddenly it's much colder than before? You know, people at that time didn't have a weather forecast, so they didn't know in advance what the sudden change would be. When I feel sleepy but not sleepy, I open my eyes and find that even the window is much brighter than usual. What is the reason for all this? Of course, the author has to think about it himself, and readers are puzzled by the idea of poetry. In fact, the author has skillfully presented the features of Snow at Night to the readers. One is that the temperature is lower than usual, so the same quilt covers me, but I feel a chill; One is that the light is brighter than usual, because the ground is covered with thick snow, which naturally reflects the light. However, since the poem is written, it will not be very clear, but will be expressed by thinking in images, so the author should present the heavy snow to the readers with his own unique means of expression. The quilt is cold, which is about the feeling details of temperature, and the window is bright, which is about the visual details of light. However, because the author is sleeping in the room, just feeling cold and bright does not confirm that there will be a heavy snow. However, the following two cutting angles accurately capture the special image that only appears when it snows and snows heavily: "I know it snows heavily at night, and I can smell the sound of bamboo as soon as I hear it." Bai Juyi is lying under the covers. Where do you know it must be snowing heavily outside? I always hear the sound of heavy snow pressing bamboo branches from my ears, and I can be absolutely sure that my judgment of "knowing the weight of snow" is correct. Moreover, if it is in the daytime and the sound is noisy, I may not hear the subtle sound of bamboo branches bent by snow, but it sounds clear in the dead of night. Bai Juyi's sensible poem is unique and accurately describes his feelings about the night snow, although he didn't see the snow at all. After reading four poems, every sentence is written as "snow at night", so this topic is also very appropriate.