For Health and Protection Before Sleep
اللَّهُمَّ إِنَّكَ خَلَقْتَ نَفْسِي وَأَنْتَ تَوَفَّاهَا، لَكَ مَمَاتُهَا وَمَحْيَاهَا، إِنْ أَحْيَيْتَهَا فَاحْفَظْهَا، وَإِنْ أَمَتَّهَا فَاغْفِرْ لَهَا، اللَّهُمَّ إِنِّي أَسْأَلُكَ الْعَافِيَةَ
Allāhumma innaka khalaqta nafsī wa Anta tawaffāhā, laka mamātuhā wa maḥyāhā. In aḥyaytahā faḥfaẓhā, wa in amattahā faghfir lahā. Allāhumma innī asʾalukal-ʿāfiyah.
O Allah, You created my soul and You take it in death. To You belong its life and death. If You keep it alive, protect it, and if You cause it to die, forgive it. O Allah, I ask You for wellbeing.
Source: Hisnul Muslim #99