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! . Then he would pray three (Rak'at of Witr). 'Aishah (RA) said: "I said, O Allah's Messenger will you sleep before you pray Witr?" He said, "O 'Aishah my eyes sleep, but my heart does not sleep."
وَرَوَى أَحْمَدُ : عَنْ عَمْرِوِ بْنِ شُعَيْبٍ , عَنْ أَبِيهِ , عَنْ جَدِّهِ نَحْوَهُ . 11 - صحيح . رواه أحمد ( 2 / 208 ) ولفظه : " إن الله زادكم صلاة إلى صلاتكم ، وهي الوتر" . والحديث وإن كان عند أحمد بسند ضعيف ، إلا أنه صحيح بما له من طرق أخرى ، وشواهد كالحديث السابق ، وتفصيل ذلك " بالأصل " .
Ahmad reported something similar to the above Hadith from 'Amr bin Shu'aib on the authority of his father who reported it on the authority of 'Amr's grandfather.