Sahih Bukhari Volume 002, Book 022, Hadith Number 289.
Narated By Kuraib Maula Ibn Abbas : 'Abdullah bin Abbas said that he had passed a night in the house of Maimuna the mother of the faithful believers , who was his aunt. He said, "I slept across the bed, and Allah's Apostle along with his wife slept lengthwise. Allah's Apostle slept till mid-night or slightly before or after it. Then Allah's Apostle woke up, sat, and removed the traces of sleep by rubbing his hands over his face. Then he recited the last ten verses of Surat-Al Imran (2). Then he went towards a hanging leather water-container and performed a perfect ablution and then stood up for prayer." 'Abdullah bin Abbas added, "I got up and did the same as Allah's Apostle had done and then went and stood by his side. Allah's Apostle then put his right hand over my head and caught my right ear and twisted it. He offered two Rakat, then two Rakat, then two Rakat, then two Rakat, then two Rakat, then two Rakat and then offered one Raka Witr. Then he lay down till the Muadh-dhin came and then he prayed two light Rakat and went out and offered the early morning (Fajr) prayer."