The Book of the Remembrance of Allah
Riyad as-Salihin #767
كتاب الأذكار
عن حذيفة، وأبي ذر رضي الله عنهما قالا: كان رسول الله صلى الله عليه وسلم إذا أوى إلى فراشه قال: «باسمك اللهم أموت وأحيا» وإذا استيقظ قال: «الحمد لله الذي أحيانا بعد ما أماتنا وإليه النشور» ((رواه البخاري)).
Hudhaifah and Abu Dharr (May Allah be pleased with him) reported:
Whenever the Messenger of Allah (ﷺ) went to bed, he would supplicate: “Bismika-Allahumma amut wa ahya (With Your Name, O Allah, I die and return to life)”; and when he woke up, he would supplicate thus: “Al-hamdu lillahilladhi ahyana ba'da ma amatana, wa ilaihin-nushur (All praise belongs to Allah Who has restored us back to life after causing us to die; and to Him shall we return).”
عن حذيفة، وأبي ذر رضي الله عنهما قالا: كان رسول الله صلى الله عليه وسلم إذا أوى إلى فراشه قال: "باسمك اللهم أموت وأحيا" وإذا استيقظ قال: "الحمد لله الذي أحيانا بعد ما أماتنا وإليه النشور" ((رواه البخاري)).
Whenever the Messenger of Allah (ﷺ) went to bed, he would supplicate: "Bismika-Allahumma amut wa ahya (With Your Name, O Allah, I die and return to life)"; and when he woke up, he would supplicate thus: "Al-hamdu lillahilladhi ahyana ba'da ma amatana, wa ilaihin-nushur (All praise belongs to Allah Who has restored us back to life after causing us to die; and to Him shall we return)."
— Riyad as-Salihin, Hadith 767