وعن حذيفة رضي الله عنه
أن رسول الله صلى الله عليه وسلم، كان إذا أراد أن يرقد وضع يده اليمنى تحت خده، ثم يقول: «اللهم قني عذابك يوم تبعث عبادك»
Whenever the Messenger of Allah (sallallahu alayhi wa sallam) intended to go to sleep, he would place his right hand under his (right) cheek and supplicate: “Allahumma qini ‘adhabaka yauma tabathu ‘ibadaka (O Allah! Guard me against Your punishment on the Day when You will resurrect Your slaves).’. In a narration in Abu Dawud, Hafsah (radiyallahu anha) said: Before going to sleep the Messenger of Allah (sallallahu alayhi wa sallam) would recite this Dua three times.’”
Riyad as-Salihin 1464, Book 16, The Book of the Remembrance of Allah, Hadith 57. 1 min read