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

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

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. Narrated by Abu Huraira (RA): The Prophet (ﷺ) said, When anyone of you go to bed, he should shake out his bed with the inside of his waist sheet, for he does not know what has come on to it after him, and then he should say: (The dua is mentioned above)

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