[Machine] The Prophet ﷺ used to pray from the evening (Isha) prayer until the dawn (Fajr) prayer eleven voluntary units (raka'at), and he would conclude every two units with the Tasleem (saying Assalamu Alaikum). He would perform the Witr prayer with one unit. When the Mu'athin finished the Adhan, he would perform two light units (raka'at), then lie down until the Mu'athin comes to him and he would go out with him.  

كَانَ النَّبِيُّ ﷺ «يُصَلِّي مَا بَيْنَ الْعِشَاءِ إِلَى الْفَجْرِ إِحْدَى عَشْرَةَ رَكْعَةً يُسَلِّمُ فِي كُلِّ رَكْعَتَيْنِ يُوتِرُ بِوَاحِدَةٍ فَإِذَا سَكَتَ الْمُؤَذِّنُ مِنَ الْأَذَانِ رَكَعَ رَكْعَتَيْنِ خَفِيفَتَيْنِ ثُمَّ اضْطَجَعَ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ فَيَخْرُجُ مَعَهُ»