question #1 Sahih Muslim 749i, Book 6, Hadith 192 : How is the night prayer structured in terms of rak’ahs according to Islamic teachings?

The night prayer consists of pairs and when you see the approach of dawn, make this number odd by one rak’ah. It was said to Ibn ‘Umar: What does the (word) pair imply? He said: (It means) that salutation is uttered after every two rak’ahs.