Yahya related to me from Malik from Ibn Shihab from Urwa ibn az- Zubayr from A'isha, the wife of the Prophet ﷺ that the Messenger of Allah ﷺ used to pray eleven rakas in the night, making them odd by a single one, and when he had finished he lay down on his right side.
عَنْ عَائِشَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُصَلِّي مِنَ اللَّيْلِ إِحْدَى عَشْرَةَ رَكْعَةً يُوتِرُ مِنْهَا بِوَاحِدَةٍ فَإِذَا فَرَغَ اضْطَجَعَ عَلَى شِقِّهِ الأَيْمَنِ