Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) used to offer voluntary prayers at night, and Sayyidah Aishah (may Allah be pleased with her) would be lying crosswise between the Prophet (peace and blessings be upon him) and the qiblah during the Prophet (peace and blessings be upon him)'s night prayers.
Ahmad recorded it, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2309