Before sleeping

بِاسْمِكَ رَبِّي وَضَعْتُ جَنْبِي، وَبِكَ أَرْفَعُهُ، فَإِن أَمْسَكْتَ نَفْسِي فارْحَمْهَا، وَإِنْ أَرْسَلْتَهَا فَاحْفَظْهَا بِمَا تَحْفَظُ بِهِ عِبَادَكَ الصَّالِحِينَ

Bismika Rabbī waḍa‘tu janbī, wa bika arfa‘uh, fa-in amsakta nafsī farḥamhā, wa in arsaltahā faḥfaẓhā bimā taḥfaẓu bihi ‘ibādakaṣ-ṣāliḥīn

With Your Name my Lord, I lay myself down; and with Your Name I rise. And if You take my soul, have mercy on it, and if You send it back then protect it as You protect Your righteous slaves.