‘Amir ibn Abdillah ibn Juda’ah narrated:
Abu Abdillah عليه السلام said: "There is no servant who recites the end of Surat al-Kahf when he goes to sleep except that he will wake up at the hour he desires."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 186