'Ali (May Allah be pleased with him) reported: 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 Allahﷺ said, "Recite Takbir thirty-four times". Al-Bukhari and Muslim.