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. (Using translation from Nasāʾī 1704)
عَنِ النَّبِيِّ ﷺ أَنَّهُ قَامَ مِنَ اللَّيْلِ فَاسْتَنَّ ثُمَّ صَلَّى رَكْعَتَيْنِ ثُمَّ نَامَ ثُمَّ قَامَ فَاسْتَنَّ وَتَوَضَّأَ وَصَلَّى رَكْعَتَيْنِ حَتَّى صَلَّى سِتًّا ثُمَّ أَوْتَرَ بِثَلَاثٍ وَصَلَّى رَكْعَتَيْنِ