The sky is a blanket, and the sun, moon and stars accompany me to sleep. What's behind?

The last two sentences are: "I dare not stretch my feet at night for fear of stepping on mountains and rivers."

Source: Untitled by Zhu Mingyuan Zhang

Original text:

The sky is a tent and the ground is a blanket. The sun, the moon and the stars sleep with me in the morning.

I dare not stretch my feet at night for fear of stepping on mountains and rivers.

Translation:

The sky is my account, the earth is my carpet, and the sun, moon and stars accompany me to sleep.

I dare not stretch my feet in my sleep, for fear that I will step on the mountains and rivers when I stretch my feet.

Extended data:

Poems with the title "Untitled" are often seen in ancient or modern poems. They seem to have no titles, but in fact, the feelings expressed by poets are stronger and deeper. No title is better than a title. The reason why "untitled" is used as the topic is because the author is inconvenient or doesn't want to directly use the topic to reveal the theme of the poem.

This kind of poetry often entrusts the author with unspeakable hidden pain, inexplicable feelings, bitter feelings, persistent pursuit and so on. Untitled poems include five-character untitled poems and seven-character untitled poems. The representative figure of ancient untitled poems is Li Shangyin. Zhang Caitian, an ancient man, once said: "Untitled poetry originated in Yuxi, and this kind of poetry can only be tactfully emotional by using seven methods." Zhang Caitian accurately summarized the form and emotion of untitled poems.