Hadith 821
Hazrat Iyas bin Amir narrates that I heard Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) saying that the Messenger of Allah (peace and blessings be upon him) used to offer voluntary prayers at night while Sayyidah Aisha (may Allah be pleased with her) would be lying between him (peace be upon him) and the Qiblah. Imam Abu Bakr (may Allah have mercy on him) says: By "he glorifies at night," what is meant is the voluntary prayer.
Hadith 822
Lady Aisha (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) would perform the night prayer (i.e., Tahajjud prayer) while I would be lying between him and the Qiblah like a bier. In the narration of Makhzumi, there is this addition: Then when the Messenger of Allah (peace and blessings be upon him) intended to pray Witr, he would move me back with his foot.