Musnad Abu Ya'la al-Mawsili 149:134

Ibrahim narrated to us, Hammad narrated to us, from Hisham ibn Urwah, from Urwah, that Aisha said: The Messenger of Allah (peace and blessings of Allah be upon him) used to pray while I was lying across between him and the Qiblah, like the lying of a funeral, under my blanket.