The Prophet ﷺ got up at night and cleaned his teeth, then he prayed two rak'ahs, then he slept. Then he got up and cleaned his teeth, then he performed wudu and prayed two rak'ahs, until he had prayed six. Then he prayed witr with three rak'ahs, and prayed two rak'ahs.  

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَامَ مِنَ اللَّيْلِ فَاسْتَنَّ ثُمَّ صَلَّى رَكْعَتَيْنِ ثُمَّ نَامَ ثُمَّ قَامَ فَاسْتَنَّ ثُمَّ تَوَضَّأَ فَصَلَّى رَكْعَتَيْنِ حَتَّى صَلَّى سِتًّا ثُمَّ أَوْتَرَ بِثَلاَثٍ وَصَلَّى رَكْعَتَيْنِ  

"I was with the Prophet ﷺ and he got up and performed wudu, cleaned his teeth while reciting this verse until he finished: 'Verily, in the creation of the heavens and the Earth, and in the alternation of night and day, there are indeed signs for men of understanding.' Then he prayed two rak'ahs, then he went back and slept until I heard him breathing deeply. Then he got up and performed wudu and cleaned his teeth. Then he prayed two rak'ahs, then he slept, then he got up and performed wudu and cleaned his teeth and prayed two rak'ahs and prayed witr with three rak'ahs."  

كُنْتُ عِنْدَ النَّبِيِّ ﷺ فَقَامَ فَتَوَضَّأَ وَاسْتَاكَ وَهُوَ يَقْرَأُ هَذِهِ الآيَةَ حَتَّى فَرَغَ مِنْهَا { إِنَّ فِي خَلْقِ السَّمَوَاتِ وَالأَرْضِ وَاخْتِلاَفِ اللَّيْلِ وَالنَّهَارِ لآيَاتٍ لأُولِي الأَلْبَابِ } ثُمَّ صَلَّى رَكْعَتَيْنِ ثُمَّ عَادَ فَنَامَ حَتَّى سَمِعْتُ نَفْخَهُ ثُمَّ قَامَ فَتَوَضَّأَ وَاسْتَاكَ ثُمَّ صَلَّى رَكْعَتَيْنِ ثُمَّ نَامَ ثُمَّ قَامَ فَتَوَضَّأَ وَاسْتَاكَ وَصَلَّى رَكْعَتَيْنِ وَأَوْتَرَ بِثَلاَثٍ  

"The Messenger of Allah ﷺ woke up and cleaned his teeth,' and he quoted the hadith.  

اسْتَيْقَظَ رَسُولُ اللَّهِ ﷺ فَاسْتَنَّ وَسَاقَ الْحَدِيثَ  

"The Messenger of Allah ﷺ used to pray eight rak'ahs at night and pray witr with three, and pray two rak'ahs before Fajr."  

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي مِنَ اللَّيْلِ ثَمَانِ رَكَعَاتٍ وَيُوتِرُ بِثَلاَثٍ وَيُصَلِّي رَكْعَتَيْنِ قَبْلَ صَلاَةِ الْفَجْرِ خَالَفَهُ عَمْرُو بْنُ مُرَّةَ فَرَوَاهُ عَنْ يَحْيَى بْنِ الْجَزَّارِ عَنْ أُمِّ سَلَمَةَ عَنْ رَسُولِ اللَّهِ ﷺ  

"The Messenger of Allah ﷺ used to pray witr with thirteen rak'ahs, and when he grew older and weaker he prayed witr with nine."  

كَانَ رَسُولُ اللَّهِ ﷺ يُوتِرُ بِثَلاَثِ عَشْرَةَ رَكْعَةً فَلَمَّا كَبِرَ وَضَعُفَ أَوْتَرَ بِتِسْعٍ خَالَفَهُ عُمَارَةُ بْنُ عُمَيْرٍ فَرَوَاهُ عَنْ يَحْيَى بْنِ الْجَزَّارِ عَنْ عَائِشَةَ  

"The Messenger of Allah ﷺ used to pray nine (rak'ahs) at night, then when he grew older and put on weight he prayed seven."  

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي مِنَ اللَّيْلِ تِسْعًا فَلَمَّا أَسَنَّ وَثَقُلَ صَلَّى سَبْعًا