Amr bin Sharhbayl, Abu Maysara عمرو بن شرحبيل الهمداني أبو ميسرة الكوفي · Chapters on Supplication

When the Prophet (ﷺ) would sleep, he would put his hand under his head then say: “O Allah, safeguard me from Your Punishment the Day You gather )” or “you resurrect your slaves (tab`athu `ibādak).”

The Messenger of Allah (ﷺ) used to lay his head upon his right hand when going to sleep, then say: “My Lord, safeguard me from Your punishment the Day You resurrect Your slaves (Rabbi qinī `adhābaka yawma tab`athu `ibādak).”