Jami` at-Tirmidhi 3417

Hudhaifah bin Al-Yaman [may Allah be pleased with him] narrated that when the Prophet (ﷺ) wanted to sleep, he would say:“O Allah, in Your Name I die and I live (Allāhumma bismika amūtu wa aḥyā).” And when he would wake, he would say: “Allah praise is due to Allah who revived my soul after causing its death and to Him is the resurrection (Al-ḥamdulillāh, alladhī aḥyā nafsī ba`da mā amātahā wa ilaihin-nushūr).”