"Messenger of Allah (S) would pray eleven Rak'ah at night, making them off with one. When he finished them he would lay down on his right side." (Using translation from Tirmidhī 440)  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ «يُصَلِّي بِاللَّيْلِ إِحْدَى عَشْرَةَ رَكْعَةً يُوتِرُ مِنْهَا بِوَاحِدَةٍ فَإِذَا فَرَغَ مِنْهَا اضْطَجَعَ عَلَى شِقِّهِ الْأَيْمَنِ»  

The Messenger of Allah ﷺ used to pray thirteen rak'ahs during the night ; he then offered two light rak'ahs of prayer when he heard the call to the dawn prayer. (Using translation from Abū Dāʾūd 1339)  

إِنَّ رَسُولَ اللهِ ﷺ كَانَ «يُصَلِّي بِاللَّيْلِ ثَلَاثَ عَشْرَةَ رَكْعَةً ثُمَّ يُصَلِّي إِذَا سَمِعَ النِّدَاءَ بِالصُّبْحِ رَكْعَتَيْنِ خَفِيفَتَيْنِ»