Dua of Sleep

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

Transliteration

Bismika Rabbee wada'tu janbee, wa bika 'arfa'uhu, fa'in 'amsakta nafsee far’hamhaa, wa 'in 'arsaltahaa fa’hfadh haa, bimaa ta’hfadhu bihi 'ibaadakas-saaliheen

Meaning

In Your name my Lord, I lie down and in Your name I rise, so if You should take my soul then have mercy upon it, and if You should return my soul then protect it in the manner You do so with Your righteous servants.

Source: Al-Bukhari 11/126 no. 6320, Muslim 4/2084 no.2714