question #1 Sahih al-Bukhari 1139, Book 19, Hadith 20 : How many rak’ahs did the Prophet Muhammad (ﷺ) typically perform during his night prayer?

I asked Aisha about the night prayer of Allah’s Messenger (ﷺ) and she said, “It was seven, nine or eleven
rak`at besides the two rak`at of the Fajr prayer (i.e. Sunna). ”