Jami` at-Tirmidhi

"Allah's Messenger (S) would pray eleven Rak'ah at night, making them off with one. When he finished them he would lay down on his right side."

Another chain with similar narration

"The Prophet (S) would pray thirteen Rak'ah at night."

"The Prophet (S) would pray nine Rak'ah in the night."

(Another chain with similar narration)

"When the Prophet (S) did not pray at night because he was prevented from it by sleep or being sleepy then he would pray twelve Rak'ah during the daytime."

Allah's Messenger (S) said: "Allah, Blessed and Exalted is He, descends to the earth's heaven every night when the first third of the night has passed. He says: "I am the Sovereign. Is there any who calls upon Me so that I may respond to him? Is there any who asks of Me that I may give him? Is there any who seeks forgiveness from Me so that I may forgive him?' He continues in that until the illumination of Al-Fajr."

The Prophet (S) said to Abu Bakr: "I passed by you while you were reciting and your voice was low." He said: "I let He who, I was consulting hear." He said: "Raise your voice." Then he said to Umar: "I passed by while you were reciting and your voice was loud." So he said: "I repel drowsiness and keep Ash-Shaitan away." So he said: "Lower your voice."

"The Prophet (S) stood (in prayer) with an Ayah from the Qur'an at night"

"I asked Aishah how the recitation of the Prophet (S) was at night. So she said: 'He would do both of those. Sometimes he was silent with his recitation and sometimes it was audible.' So I said: 'All praise is due to Allah, the One who made the matter broad.'"

The Prophet (S) said: "The most virtuous prayer of yours is in your homes, except for the obligatory."

The Prophet (S) said: "Offer Salat in your homes and do not turn them into graves."

"Allah's Messenger came out to us and he said: 'Indeed Allah has assisted you with a Salat that is better for you than red camels: Al-Witr which Allah made for you between the Isha prayer till Al-Fajr has begun."

"Al-Witr is not incumbent like your obligatory prayers, but it is a Sunnah of Allah's Messenger who said: "Indeed Allah is Witr (One), and He loves Al-Witr, so perform Al-Witr O people of the Qur'an."

Ali said: "Al-Witr is not incumbent like the status of the obligatory prayers, but it is a Sunnah which Allah's Messenger practiced."

"Allah's Messenger ordered me to perform Al-Witr before sleeping."

he asked Aishah about the Witr of the Prophet. She said: "He would perform Witr during all of the night; (either) its beginning, its middle, or its end. So when he died, his Witr ended, during the approachof As-Sahar."

"The Prophet would perform Witr with thirteen . When he was older and became weak he performed Witr with seven."

"The night prayer of Allah's Messenger was thirteen Rak'ah, five of which were his Witr, not sitting in any of them except at the end of them. When the Mu'adh-dhin called the Adhan he would stand to perform two light (Rak'ah)."

"Allah's Messenger would perform Al-Witr with three, reciting nine Surah from the Mufassal in them, reciting three Surah in each Rak'ah with Say: "Allah is One." At the end of them."Muhammad bin Sirin said: "They would perform Al-Witr with five, with three, and with one Rak'ah, and they considered all of that to be good."