(24) باب كَانَ النَّبِيُّ صلى الله عليه وسلم تَنَامُ عَيْنُهُ وَلاَ يَنَامُ قَلْبُهُ
Narrated Abu Salama bin `Abdur-Rahman:
That he asked `Aisha "How was the prayer of Allah's Messenger (ﷺ) in the month of Ramadan?" She replied, "He used not to pray more than eleven rak`at whether in Ramadan or in any other month. He used to offer four rak`at, let alone their beauty and length, and then four rak`at, let alone their beauty and length. Afterwards he would offer three rak`at. I said, 'O Allah's Messenger (ﷺ)! Do you go to bed before offering the witr prayer?' He said, 'My eyes sleep, but my heart does not sleep."'
Reference: Sahih al-Bukhari 3569
In-book reference: Book 61, Hadith 78
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 56, Hadith 769