Dua for Dying upon the fitrah

If you take to your bed, then perform ablution, lie on your right side and then supplicate:

اللّٰهُمَّ أَسْلَمْتُ نَفْسِيْ إِلَيْكَ، وَفَوَّضْتُ أَمْرِيْ إِلَيْكَ، وَوَجَّهْتُ وَجْهِيْ إِلَيْكَ، وَأَلْجَأْتُ ظَهْرِيْ إِلَيْكَ، رَغْبَةً وَّرَهْبَةً إِلَيْكَ، لاَ مَلْجَأَ وَلاَ مَنْجَا مِنْكَ إِلاَّ إِلَيْكَ، آمَنْتُ بِكِتَابِكَ الَّذِيْ أَنْزَلْتَ، وَبِنَبِيِّكَ الَّذِيْ أَرْسَلْتَ 

O Allaah, I submit my soul unto You, and I entrust my affair unto You, and I turn my face towards You, and I totally rely on You, in hope and fear of You. Verily there is no refuge nor safe haven from You except with You. I believe in Your Book which You have revealed and in Your Prophet whom You have sent.

Allahumma aslamtu nafsee ilayk, wafawwadtu amree ilayk, wawajjahtu wajhee ilayk, wa-alja/tu thahree ilayk, raghbatan warahbatan ilayk, la maljaa wala manja minka illa ilayk, amantu bikitabikal-lathee anzalt, wabinabiyyikal-lathee arsalt