Is the Qiyam-ul-Layl prayer performed two Rak'ahs at a time, four or more times, followed by the Witr Sunnah, or is it performed four Rak'ahs at a time, followed by the Witr Sunnah? And in the latter case, is Al-Fatiha recited in the second and fourth Rak'ahs?

The best way to perform the night prayer (Salat al-Layl) is two rak'ahs at a time, but it is permissible to pray four or more with a single salam. Al-Fatihah should be recited in every rak'ah, as it is a pillar of the prayer. It is best to give the salam after every two rak'ahs in voluntary daytime prayers.