When Allah's Messenger (ﷺ) went to bed, he used to sleep on his right side and then say, "All-ahumma aslamtu nafsi ilaika, wa wajjahtu wajhi ilaika, wa fauwadtu `Amri ilaika, wa alja'tu zahri ilaika, raghbatan wa rahbatan ilaika. La Malja'a wa la manja minka illa ilaika. Amantu bikitabika al-ladhi anzalta wa nabiyyika al-ladhi arsalta! Allah's Messenger (ﷺ) said, "Whoever recites these words (before going to bed) and dies the same night, he will die on the Islamic religion (as a Muslim).
Sahih al-Bukhari Book 80, Hadith 12
← Previous Hadith When the Prophet (ﷺ) went to bed at night, he would put his hand under his cheek and then say, "Allahumma bismika amutu wa ahya," and when he got up, he would say, "Al-Hamdu lil-lahi al-ladhi ahyana ba'da ma amatana, wa ilaihi an-nushur."

Sahih al-Bukhari Book 80, Hadith 11 Next Hadith → One night I slept at the house of Maimuna. The Prophet (ﷺ) woke up, answered the call of nature, washed his face and hands, and then slept. He got up (late at night), went to a water skin, opened the mouth thereof and performed ablution not using much water, yet he washed all the parts properly and then offered the prayer. I got up and straightened my back in order that the Prophet (ﷺ) might not feel that I was watching him, and then I performed the ablution, and when he got up to offer the prayer, I stood on his left. He caught hold of my ear and brought me over to his right side. He offered thirteen rak`at in all and then lay down and slept till he started blowing out his breath as he used to do when he slept. In the meantime Bilal informed the Prophet (ﷺ) of the approaching time for the (Fajr) prayer, and the Prophet offered the Fajr (Morning) prayer without performing new ablution. He used to say in his invocation, Allahumma ij`al fi qalbi nuran wa fi basari nuran, wa fi sam`i nuran, wa`an yamini nuran, wa`an yasari nuran, wa fawqi nuran, wa tahti nuran, wa amami nuran, wa khalfi nuran, waj`al li nuran." Kuraib (a sub narrator) said, "I have forgotten seven other words, (which the Prophet (ﷺ) mentioned in this invocation). I met a man from the offspring of Al-`Abbas and he narrated those seven things to me, mentioning, '(Let there be light in) my nerves, my flesh, my blood, my hair and my body,' and he also mentioned two other things."

Sahih al-Bukhari Book 80, Hadith 13