Musnad Ahmad 1153:1130

I read to Abd al-Rahman ibn Mahdi: Malik, from Abu al-Nadr, the freed slave of Umar ibn Ubayd Allah, from Abu Salamah ibn Abd al-Rahman, from Aisha, the wife of the Prophet, may Allah bless him and grant him peace, that she said: "I used to sleep in front of the Messenger of Allah, may Allah bless him and grant him peace, with my feet in the direction of his prayer. When he prostrated, he would nudge me, so I would draw back my feet, and when he stood, I would stretch them out." And the houses did not have lamps in them in those days.