Sunan Abi Dawud Book 5, Hadith 103
Sa'd ibn Hisham said: I came to Medina and called upon Aisha, and said to her: Tell me about the prayer of the Messenger of Allah (ﷺ).
She said: The Messenger of Allah (ﷺ) used to lead the people in the night prayer, and then go to his bed and sleep. When midnight came he got up, went to answer the call of nature and to perform ablution with water. Having performed ablution, he entered the mosque and prayed eight rak'ahs.
To my mind he performed the recitation of the Qur'an, bowing and prostrating equally. He then observed witr with one rak'ah and prayed two rak'ahs sitting. Then he lay down on the ground. Sometimes Bilal came to him and called him for prayer. He then dozed, and sometimes I doubted whether he dozed or not, till he (Bilal) called him for prayer.
This is the prayer he offered till he grew old or put on weight. She then mentioned how he put on weight as Allah wished.
The Messenger of Allah (ﷺ) used to observe the witr prayer with nine rak'ahs. Then he used to pray seven rak'ahs (of witr prayer). He would pray two rak'ahs sitting after the witr in which he would recite the Qur'an (sitting). When he wished to bow, he stood up and bowed and prostrated.
Abu Dawud said: These two traditions have been transmitted by Khalid b. 'Abd Allah al-Wasiti. In his version he said: 'Alqamah b. Waqqas said: O mother, how did he pray the two rak'ahs ? He narrated the rest of the tradition to the same effect.
"In the creation of the heavens and earth" to the end of the surah. Then he stood up and prayed two rak'ahs in which he prolonged the standing, bowing, and prostrations. He then uttered turned away and slept till he bagan to snore. This he did three times. This made six rak'ahs in all. He would use tooth-stick, then perform ablution, and recite those verses. He then observed the witr prayer. The version of 'Uthman has: with three rak'ahs. The mu'adhdhin then came to him and he went out for prayer. The version of Ibn 'Isa adds: He then observed witr prayer ; then Bilal came to him and called him for prayer when the dawn broke. He then prayed the two rak'ahs of the dawn prayer. He then went out for prayer. Then both the narrators were agreed: He beagan to supplicate saying: O Allah, place light in my heart, light in my tongue, light in my hearing, light in my eyesight, light on my right hand, light on my left hand, light in front of me, light behing me, light below me, O Allah, give me abundant light.