Hudhaifah and Abu Dharr (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) used to supplicate when he went to bed at night: "Bismik-Allahumma ahya wa amut (With Your Name, O Allah, I expire and return to life)."[Al- Bukhari]. (ID)
App reference (ID): Book 16, Hadith 51 (ID)
Arabic/English book reference (ID): Book 16, Hadith 1458 (ID)