(107) باب مَا يُقَالُ عِنْدَ النَّوْمِ
Farwah b. Nawfal quoted his father as saying that the Prophet (ﷺ) said to Nawfal (his father):
Recite (the Surah) 'Say, O you disbelievers!' and then go to sleep at its end, for it is a declaration of freedom from polytheism.
Reference: Sunan Abi Dawud 5055
In-book reference: Book 43, Hadith 283
English translation: Book 42, Hadith 5037