When anyone of you goes to bed, he should shake out his covers, for he does not know what has come onto it after him. Then he should say:

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

Bismika rabbi wada’tu janbi wabika arfa uhu, ‘in amsakta nafsi farhamha, wa’in arsaltaha fahfath ha bima tahfathu bihi ibadaka salihin.

In Your Name I lay on my side on this bed and with Your Name I will rise therefrom. If You take my soul, bestow mercy on it, and if You release it, protect it as You protect Your righteous slaves.