Hadith 6325
Narrated Abu Dhar: Whenever the Prophet lay on his bed, he used to say: "Allahumma bismika amutu wa ahya," and when he woke up he would say: "Al-hamdu lil-lahilladhi ahyana ba'da ma an atana, wa ilaihi an-nushur."
Hadith 7395
Narrated Abu Dharr: When the Prophet went to bed at night, he used to say: "Bismika namutu wa nahya." And when he got up in the morning, he used to say, "Al hamdu li l-lahi al-ladhi ahyana ba'da ma amatana, wa ilaihi-nnushur."