Riyad as-Salihin

The Messenger of Allah (ﷺ) used to supplicate when he went to bed at night: "Bismik-Allahumma ahya wa amut (With Your Name, O Allah, I expire and return to life).".

The Messenger of Allah (ﷺ) said to me and to Fatimah (May Allah be pleased with her) (Ali's wife and the Prophet's daughter), "When you go to bed, recite: Takbir (Allahu Akbar) thirty-three times and Tasbih (Subhan-Allah) thirty-three times and Tahmid (Al-hamdu lillah) thirty-three times."Another narration is: The Messenger of Allah (ﷺ) said, "Recite Tasbih thirty-four times."Another narration is: The Messenger of Allah(ﷺ) said, "Recite Takbir thirty-four times.".

The Messenger of Allah (ﷺ) said, "When any of you goes to bed, he should shake off (or dust off) his bedsheet because he does not know what might have fallen on it after he had left it. Then he should recite: 'Bismika Rabbi wada'tu janbi, wa bika arfa'uhu, in amsakta nafsi farhamha, wa in arsaltaha fahfazha bima tahfazu bihi 'ibadakas-salihin .

Whenever the Messenger of Allah (ﷺ) went to bed, he would blow upon his hands recite Al-Mu'awwidhat; and pass his hands over his body..

The Messenger of Allah (ﷺ) said, "Whenever you intend to go to bed, perform Wudu' as is done for Salat (prayer); and then lie down on the right side and recite: 'Allahumma aslamtu nafsi ilaika, wa fawwadtu amri ilaika, wal-ja'tu zahri ilaika, raghbatan wa rahbatan ilaika, la malja'a wa la manja minka illa ilaika, amantu bikitabik-alladhi anzalta, wa binabiyyik-alladhi arsalta .

Whenever the Prophet (ﷺ) went to his bed, he would say: "Al-hamdu lillah-illadhi at'amana wa saqana, wa kafana wa awana, fakam mimman la kafiya lahu wa la mu'wiya (Praise is due to Allah Who has fed us, provided us drink, satisfied us and gave us protection. Many are those who have no one to provide for them, or give them shelter).".

Whenever the Messenger of Allah (ﷺ) intended to go to sleep, he would place his right hand under his (right) cheek and supplicate: "Allahumma qini 'adhabaka yauma tab'athu 'ibadaka (O Allah! Guard me against Your punishment on the Day when You will resurrect Your slaves).".In a narration in Abu Dawud, Hafsah (May Allah be pleased with her) said: Before going to sleep the Messenger of Allah (ﷺ) would recite this Du'a three times.