Sunan Abi Dawud Book 5, Hadith 108
I spent a night in the house of my maternal aunt Maimunah, daughter of al-Harith. The Prophet (ﷺ) offered the night prayer. He then came and prayed four rak'ahs and slept. He then stood up and prayed. I stood at his left side. He made me go round and made me stand at his right side. He then prayed five rak'ahs and slept, and I heard his snoring. He then got up and prayed two rak'ahs. Afterwards he came out and offered the dawn prayer.
I spent a night with my maternal aunt Maimunah. The Messenger of Allah (ﷺ) came after the evening has come. He asked: Did the boy pray ? She said: Yes. Then he lay down till a part of night had passed as much as Allah willed; he got up, performed ablution and prayed seven or five rak'ahs, observing witr with them. He uttered the salutation only in the last of them.
He (the Prophet) got up and prayed eight rak'ahs in pairs, and then observed witr with five rak'ahs and he did not sit between them.