Night prayer of the Holy Prophet (sa) and his practice before Fajr

عَنْ عُرْوَةَ، أَنَّ عَائِشَةَ، أَخْبَرَتْهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يُصَلِّي إِحْدَى عَشْرَةَ رَكْعَةً، كَانَتْ تِلْكَ صَلاَتَهُ ـ تَعْنِي بِاللَّيْلِ ـ فَيَسْجُدُ السَّجْدَةَ مِنْ ذَلِكَ قَدْرَ مَا يَقْرَأُ أَحَدُكُمْ خَمْسِينَ آيَةً قَبْلَ أَنْ يَرْفَعَ رَأْسَهُ، وَيَرْكَعُ رَكْعَتَيْنِ قَبْلَ صَلاَةِ الْفَجْرِ، ثُمَّ يَضْطَجِعُ عَلَى شِقِّهِ الأَيْمَنِ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ لِلصَّلاَةِ‏.‏

Hazrat Aishah^ra related (through Hazrat ʿUrwah^ra) that, “Allah’s Messenger^sa used to offer eleven rak‘ahs; that was his entire (night) prayer. During it, he would remain in each prostration for as long as it would take one of you to recite about fifty Quranic verses, before he raised his head. He would then pray two rak‘ahs before the [obligatory] Fajr prayer and lie on his right side until the mezzin came to call him for the salat.”

(Sahih al-Bukhari, Kitab al-witr, Bab ma ja’a fi l-witr, Hadith 994)