One night I slept at the house of (my aunt) Maimuna and the Prophet ﷺ was there on that night. He performed ablution and stood up for the prayer. I joined him and stood on his left side but he drew me to his right and prayed thirteen rakʿat and then slept till I heard his breath sounds. And whenever he slept, he used to breathe with audible sounds. The Mu'adh-dhin came to the Prophet ﷺ and he went out and prayed the morning prayer) without repeating the ablution. (Using translation from Bukhārī 698)   

بِتُّ عِنْدَ مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ وَؓ وَرَسُولُ اللهِ ﷺ عِنْدَهَا تِلْكَ اللَّيْلَةَ فَتَوَضَّأَ رَسُولُ اللهِ ﷺ ثُمَّ قَامَ يُصَلِّي فَقُمْتُ عَنْ يَسَارِهِ فَأَخَذَنِي فَجَعَلَنِي عَنْ يَمِينِهِ فَصَلَّى فِي تِلْكَ اللَّيْلَةِ ثَلَاثَ عَشْرَةَ رَكْعَةً ثُمَّ نَامَ رَسُولُ اللهِ ﷺ حَتَّى نَفَخَ وَكَانَ إِذَا نَامَ نَفَخَ ثُمَّ أَتَاهُ الْمُؤَذِّنُ فَخَرَجَ فَصَلَّى وَلَمْ يَتَوَضَّأْ قَالَ عَمْرٌو فَحَدَّثْتُ بِهَا بُكَيْرَ بْنَ الْأَشَجِّ فَقَالَ حَدَّثَنِي كُرَيْبٌ بِذَلِكَ  

How did the Messenger of Allah ﷺ pray during Ramadhan ? She said: The Messenger of Allah ﷺ did not pray more than eleven rak'ahs during Ramadhan and other than Ramadhan. He would pray four rak'ahs. Do not ask about their elegance and length. He then would pray for rak'ahs. Do not ask about their alegance and length. Then he would pray three rak'ahs. 'Aishah said: I asked: Messenger of Allah, do you sleep before observing witr ? He replied: 'Aishah, my eyes sleep, but my heart does not sleep. (Using translation from Abū Dāʾūd 1341)   

عَائِشَةَ ؓ زَوْجَ النَّبِيِّ ﷺ كَيْفَ كَانَتْ صَلَاةُ رَسُولِ اللهِ ﷺ فِي رَمَضَانَ؟ فَقَالَتْ مَا كَانَ رَسُولُ اللهِ ﷺ 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 اللهِ أَتَنَامُ قَبْلَ أَنْ تُوتِرَ؟ فَقَالَ يَا عَائِشَةُ إِنَّ عَيْنِيَّ تَنَامَانِ وَلَا يَنَامُ قَلْبِي لَفْظُ حَدِيثِ الْقَعْنَبِيِّ  

I heard Anas bin Malik telling us about the night when the Prophet ﷺ was made to travel from the Kaʿba Mosque. Three persons (i.e. angels) came to the Prophet ﷺ before he was divinely inspired was an Aspostle), while he was sleeping in Al Masjid-ul-Haram. The first (of the three angels) said, "Which of them is he?" The second said, "He is the best of them." That was all that happened then, and he did not see them till they came at another night and he perceived their presence with his heart, for the eyes of the Prophet ﷺ were closed when he was asleep, but his heart was not asleep (not unconscious). This is characteristic of all the prophets: Their eyes sleep but their hearts do not sleep. Then Gabriel took charge of the Prophet ﷺ and ascended along with him to the Heaven. (Using translation from Bukhārī 3570)   

يُحَدِّثُنَا عَنْ لَيْلَةِ أُسْرِيَ بِرَسُولِ اللهِ ﷺ مِنْ مَسْجِدِ الْكَعْبَةِ أَنَّهُ جَاءَهُ ثَلَاثَةُ نَفَرٍ قَبْلَ أَنْ يُوحَى إِلَيْهِ وَهُوَ نَائِمٌ فِي الْمَسْجِدِ الْحَرَامِ فَقَالَ أَوَّلُهُمْ هُوَ هُوَ وَقَالَ أَوْسَطُهُمْ هُوَ خَيْرُهُمْ وَقَالَ آخِرُهُمْ خُذُوا خَيْرَهُمْ فَكَانَتْ تِلْكَ فَلَمْ يَرَهُمْ حَتَّى جَاءُوهُ لَيْلَةً أُخْرَى فِيمَا يَرَى قَلْبُهُ وَالنَّبِيُّ ﷺ تَنَامُ عَيْنُهُ وَلَا يَنَامُ قَلْبُهُ وَكَذَلِكَ الْأَنْبِيَاءُ عَلَيْهِمُ الصَّلَاةُ وَالسَّلَامُ تَنَامُ أَعْيُنُهُمْ وَلَا تَنَامُ قُلُوبُهُمْ وَذَكَرَ الْحَدِيثَ بِطُولِهِ