Musnad Ahmad 1153:1327

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from 'Urwah, from 'Aishah, she said: "The Messenger of Allah (peace and blessings of Allah be upon him) used to pray eleven rak'ahs at night. When the dawn broke, he would pray two light rak'ahs, then he would recline on his right side until the mu'adhdhin came to him to inform him of the prayer."