اللَّهُمَّ أَسْلَمْتُ نَفْسِي إِلَيْكَ، وَفَوَّضْتُ أَمْرِي إِلَيْكَ، وَوَجَّهْتُ وَجْهِي إِلَيْكَ، وَأَلْجَأْتُ ظَهْرِي إِلَيْكَ، رَغْبَةً وَرَهْبَةً إِلَيْكَ، لَا مَلْجَأَ وَلَا مَنْجَا مِنْكَ إِلَّا إِلَيْكَ
Allahumma aslamtu nafsi ilayk, wa fawwadtu amri ilayk, wa wajjahtu wajhi ilayk, wa alja'tu zahri ilayk, raghbatan wa rahbatan ilayk, la malja'a wa la manja minka illa ilayk
O Allah, I submit myself to You, entrust my affairs to You, turn my face to You, and lean my back on You, out of hope and fear of You. There is no refuge or escape from You except to You.
Recite before sleeping when feeling anxious or worried
The Prophet (PBUH) taught this dua to be said before sleeping, expressing complete trust and submission to Allah.