Sūrah al-Kāfirūn
It is recommended for one to recite Sūrah al-Kāfirūn before going to sleep. The proof is:
On the authority of Farwah b. Nawfal, [who narrated] from his father: that the Prophet, may the praise and protection of Allāh be upon him, said to Nawfal:
“Read {Say: O you disbelievers!}, then go to sleep at the end of it, for indeed it is a complete disavowal of polytheism.”
Reported by the Five except for Ibn Mājah, and the wording is that of Abū Dāwūd.
Source: Abū Dāwūd (5055), al-Tirmidhī (3403), al-Nasāʾī in al-Kubrá (10569) and (11645), Aḥmad (23807) and Ṣaḥīḥ al-Targhīb (605) by al-Albānī.
Salafi Knowledge 