The novel's title, Night, is symbolic of the Jews suffering, and the occurrences that changed their lives...... all of the things that happened in the "night".
Note, they learned of their deportation at night, the death march took place during the night, and Elie's father was taken away during the night.
Night. No one prayed, so that the night would pass quickly. The stars were only sparks of the fire which devoured us. Should that fire die out one day, there would be nothing left in the sky but dead stars, dead eyes.
Night