Why can’t “I” sleep while I’m hiking tomorrow?

The reason why "I" in "I'm going to go hiking tomorrow" is tossing and turning and unable to sleep is: I'm going to go hiking tomorrow, and the author has been thinking about the sea and the clouds in that place. He's looking forward to fun things, and he's too excited, so he can't sleep. . The original text of "Going Hiking Tomorrow" is as follows: Turn over... Alas! Can't sleep. Is the sea there really as many colors as the teacher said? Turn over... Alas! Can't sleep. Are the clouds in that place really as white and soft as my classmates said? Turn over... turn over... Alas! When will it be dawn? /qa/2020/04/09/16/1586420763606999

Extended information: The whole poem "Going Hiking Tomorrow" expresses the inner excitement and anticipation of a child on the eve of the hike. The author cleverly connects the two things "can't sleep" and "we have to go hiking tomorrow". The same interjection "alas" is repeated three times in the poem, which increases the emotional intensity each time. In 2016, this poem was selected into the new edition of the Chinese textbook for the first grade of primary school published by the People's Education Press as the 9th lesson text of Group 7. About the author: Fang Suzhen is a senior children's literature writer in Taiwan, China. She has long been engaged in the creation and translation of children's poems, fairy tales and picture books, as well as the compilation of Chinese textbooks. He has successively served as the chairman of the Cross-Strait Children's Literature Research Association, the editorial board member of Kangxuan Textbooks, and the Chinese Language Consultant of Hong Kong Education Press. His representative works include "I Have Friendships for Rent", "Cute Animal Fucks", and "True and False Little Pearls".