When the Prophet (ﷺ) went to bed, he used to say, "Allahumma bismika ahya wa amut." And when he woke up in the mornings he used to say, "Al-hamdu li l-lahi al-ladhi ahyana ba'da ma amatana wa ilaihi-nnushur."
Reference: Sahih al-Bukhari 7394 In-book : Book 97, Hadith 23 USC-MSA web (English) : Vol. 9, Book 93, Hadith 491 (deprecated)
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