question #3 Sahih Muslim 749c, Book 6, Hadith 179 : What is the significance of making the night prayer an odd number of rak’ahs?

A man stood up and said. Messenger of Allah, how is the night prayer? The Messenger of Allah (ﷺ) said: The night prayer consists of pair, but if you apprehend the rise of dawn, make it odd number by observing one rak’ah.