It is narrated from Hazrat Aisha (may Allah be pleased with her) that sometimes when the Prophet (peace and blessings be upon him) would pray at night, I would be lying like a corpse between him and the Qiblah. When he wanted to pray Witr, he would touch my feet, and I would understand that the Prophet (peace and blessings be upon him) was about to pray Witr, so I would move back.