This night, the pillow was ice, which surprised me. I saw the light snow outside the window. Stunned, here means surprised. The poet has been lying in bed, but he is surprised that the quilt and pillow are so cold. He sees that the window is very bright, which is the light reflected by snow. Here, the poet uses "stunned" to "look again", which is apt and ingenious, seemingly unintentional, but in fact it seems intentional. The poet felt very cold, and only when he saw the heavy snow outside the window did he know that the weather had changed a lot.
It's late at night until it snows heavily, because you can hear the sound of bamboo branches breaking from time to time. The poet said that it was late at night, and he knew it was snowing heavily, because he could hear the sound of snow pressing bamboo from time to time. The poet reversed the ins and outs of these two sentences, speculating that there should be "the sound of folding bamboo when smelling" before "the snow is known at night". This way of writing puts "heavy snow" in the first sentence, which strengthens the effect of heavy snow.
Extended data
Bai Juyi, a native of Henan, comes from a good family. Bai Juyi should have had a happy childhood, but he suffered a series of hardships. Fortunately, he worked very hard in his childhood. He was brilliant after reading, with sores on his tongue and calluses on his hands, and his hair turned white at a young age.
Bai Juyi, who achieved success at a young age, has embarked on a career, but it is not so smooth. After his mother died, he resigned in order to fulfill his filial piety. He was labeled as "saying things beyond his authority" for maintaining friendship with friends, and was also placed in his position on the charge of "damaging the cult of fame" (unfilial), so he was demoted to Jiangzhou Sima.
In the winter of the eleventh year of Tang Xianzong Yuanhe (8 16), what kind of winter did you experience in a lonely land and disillusioned despair? The pillow is like ice, and the heart is worried. Seeing the snow outside the window in the cold and silent night, I felt it, so I wrote this song "Snow at Night".
Baidu encyclopedia-night snow