Riyad as-Salihin, 814

Al-Bara' bin 'Azib (May Allah be pleased with them) reported:

Messenger of Allah (ﷺ) directed me thus: "Whenever you go to bed, perform Wudu' as you do for Salat then (before sleeping) recite: 'O Allah! I have submitted myself to You, I have turned myself to You, committed my affairs to You and sought Your refuge for protection out of desire for You and fear of You (expecting Your reward and fearing Your punishment). There is no refuge and no place of safety from You but with You. I believe in the Book You have revealed and in the Prophet (ﷺ) You have sent."' Messenger of Allah (ﷺ) added: "If anyone recites these words and dies during the night, he will die on the true Deen, and if he remains alive till the morning, he will obtain good. And make this supplication your last words (before sleeping)." [Al-Bukhari and Muslim].

وعنه قال‏:‏ قال لي رسول الله صلى الله عليه وسلم ‏:‏ ‏"‏إذا أتيت مضجعك فتوضأ وضوءك للصلاة، ثم اضطجع على شقك الأيمن ، وقل ‏.‏‏.‏‏.‏ ‏"‏ وذكر نحوهن وفيه‏:‏ ‏"‏ واجعلهن آخر ما تقول‏" (‏‏(‏متفق عليه‏)‏‏)‏.‏‏

References1 variant

In-Book Reference: Book 4, Hadith 2

Sharh · explanationclick to expand

Guidance from the Hadiths: 1) It is recommended to lie on the right side, as this does not burden the heart. This posture is consistent with the Sunnah and easier on the body. 2) It is recommended that the Muslim sleeps in a state of purification, which makes him safer from Satan’s manipulation. 3) Out of His wisdom and mercy, Allah Almighty laid down specific Dhikr to be said during the different actions people engage in. Thus, they do not become heedless of mentioning their Lord.

Related hadiths2