Narrated 'Aishah (RA):

Allah's Messenger (ﷺ) did not offer more than eleven (voluntary) Rak'at during Ramadan nor during other than Ramadan. He offered four Rak'at - Do not ask about their beauty and length! (It is beyond description or imitation]. Again he would pray four Rak'at - Do not ask about their beauty and length! [It is beyond description or imitation]. Then he would pray three (Rak'at of Witr). 'Aishah (RA) said: "I said, O Allah's Messenger (ﷺ) will you sleep before you pray Witr?" He said, "O 'Aishah my eyes sleep, but my heart does not sleep." [Agreed upon].

وَعَنْ عَائِشَةَ رَضِيَ اَللَّهُ عَنْهَا قَالَتْ: { ]مَا] كَانَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-يَزِيدُ فِي رَمَضَانَ وَلَا فِي غَيْرِهِ عَلَى إِحْدَى عَشْرَةَ رَكْعَةً, يُصَلِّي أَرْبَعًا, فَلَا تَسْأَلْ عَنْ حُسْنِهِنَّ وَطُولِهِنَّ, ثُمَّ يُصَلِّي أَرْبَعًا, فَلَا تَسْأَلْ عَنْ حُسْنِهِنَّ وَطُولِهِنَّ, ثُمَّ يُصَلِّي ثَلَاثًا.‏ قَالَتْ عَائِشَةُ, فَقُلْتُ: يَا رَسُولَ اَللَّهِ, أَتَنَامُ قَبْلَ أَنْ تُوتِرَ? قَالَ:

يَا عَائِشَةُ, إِنَّ عَيْنَيَّ تَنَامَانِ وَلَا يَنَامُ قَلْبِي

.‏ } مُتَّفَقٌ عَلَيْهِ .‏ [1]‏ .‏