dua for Before sleeping

 1)

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

 

Bismika rabbee wadaAAtu janbee wabika arfaAAuh, fa-in amsakta nafsee farhamha, wa-in arsaltaha fahfathha bima tahfathu bihi AAibadakas-saliheen.
Translation
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.

2)

 اللَّهمَّ خَلَقْتَ نَفْسِي وَأَنْتَ تَوَفَّاهَا لَكَ مَمَاتُهَا وَمَحْيَاهَا، إِنْ أَحْيَيْتَهَا فَاحْفَظْهَا، وَإِنْ أَمَتَّهَا فَاغْفِرْ لَهَا. اللَّهمَّ إِنِّي أَسْأَلُكَ العَافِيَةَ

 

Allahumma khalaqta nafsee wa-anta tawaffaha laka mamatuha wamahyaha in ahyaytaha fahfathha, wa-in amattaha faghfir laha. Allahumma innee as-alukal-AAafiyah.
Translation
O Allah, You have created my soul and it is for You to take it in death. Its death and its life are in Your Hand. If You cause it to live then protect it and if You cause it to die then forgive it. O Allah, I ask you to keep me safe and sound. 

3)

اللَّهُمَّ قِنِي عَذَابَكَ يَوْمَ تَبْعَثُ عِبَادَكَ

 

Allahumma qinee AAathabaka yawma tabAAathu AAibadak.
Abu Dawud: 5045
Translation
O Allah, protect me from Your punishment on the day Your servants are resurrected.
Reference

4)

بِاسْـمِكَ اللَّهُمَّ أَمُوتُ وَأَحْيَا

Bismikal-lahumma amootu wa-ahya.
In Your name O Allah, I live and die.
Translation
Benefits and Remarks
Recite this dua three times. When Prophet (SAW) wanted to lie down to sleep, he used to place his right hand under his cheek and recite this dua.