What does the sentence the night was growing longer never ending suggest about the authors viewpoint

He feels like the horrors he is experiencing will last forever.

Explanation:

"Night" is Elie Wiesel's book in which he shares his experience in Nazi concentration camps (Auschwitz and Buchenwald) during the Second World War. The narrator of the story is Eliezer, a Jewish teenager.

The above-mentioned sentence suggests that the time passes slowly. Given the setting of the story, it is not surprising that the narrator has lost track of the time due to all the hardships that he went through. He feels that there is no end to the horrors in which he found himself.

taking into account that a theme is the central topic a text treats and can be developed through a story, play, poem etc. the following are themes that can be further developed:  

my best friend jeffrey has many unusual interests. (the story could be about each of the unususal interests)

once a man gives his soul over to evil, he can never go back. (this could be a saying or a proverb)

the three sheepdogs lay around the yard all day. (it could be developed detailing how each of these sheepdogs lay around)

a priest's collar has an unusual effect upon people. (it could be developed detailing the different effect upon people)

innocence is a powerful force in a world full of corruption. (it could be developed detailing how is a world full of corruption)

king lear is a play shakespeare wrote later. (it is just a sentence and doesnt give any idea or topic to be discussed in details.

evil often wears the disguise of innocence. (this could be a saying or a proverb)