question #1 Sahih Muslim 765, Book 6, Hadith 232 : How did the Prophet Muhammad (ﷺ) structure his night prayer in terms of the number and length of rak’ahs?

I would definitely watch at night the prayer observed by the Messenger of Allah (ﷺ). He prayed two short rak’ahs, then two long, long, long rak’ahs, then he prayed two rak’ahs which were shorter than the two preceding rak’ahs, then he prayed two rak’ahs which were shorter than the two preceding, then he prayed two rak’ahs which were shorter than the two preceding, then observed a single one (Witr), making a total of thirteen rak’ahs