What a Person Should Say When They Lie Down to Sleep
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 64
وَ رَوَى عَامِرُ بْنُ عَبْدِ اَللَّهِ بْنِ جُذَاعَةَ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ: «مَا مِنْ عَبْدٍ يَقْرَأُ آخِرَ اَلْكَهْفِ حِينَ يَنَامُ إِلاَّ اِسْتَيْقَظَ مِنْ مَنَامِهِ فِي اَلسَّاعَةِ اَلَّتِي يُرِيدُ.
Amir ibn Abdullah ibn Juza'ah narrated from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام who said: "There is no servant who recites the end of Surah al-Kahf before sleeping except that they will wake up at the hour they desire."
- Ṣaḥīḥ al-Faqīh, p. 68