Aisha reported: The Prophet, peace and blessings be upon him, would pray eleven cycles in the night. When dawn arrived, he would pray two brief cycles, then lie on his right side until the caller came to announce the prayer.
The last third of a night has a certain sunnah attached to it. 2 cycles of prayer at a time - when everybody else is sleeping - followed by an odd number of rakats which we call "Witr" - a specific prayerthat Allah SWT loves. You can even make dua at witr, inshaAllah.
