question #2 Sahih Muslim 738e, Book 6, Hadith 156 : What is the significance of Witr prayer in the nightly prayers of the Prophet Muhammad (ﷺ)?

It is reported on the authority of ‘A’isha that the prayer of Allah’s Messenger (ﷺ) in the night consisted of ten rak’ahs. He observed a Witr and two rak’ahs (of Sunan) of the dawn prayer, and thus the total comes to thirteen rak’ahs.