One should recite the following duaa before going to sleep:
اللهُمَّ خَلَقْتَ نَفْسِي وَأَنْتَ تَوَفَّاهَا، لَكَ مَمَاتُهَا وَمَحْيَاهَا، إِنْ أَحْيَيْتَهَا فَاحْفَظْهَا، وَإِنْ أَمَتَّهَا فَاغْفِرْ لَهَا، اللهُمَّ إِنِّي أَسْأَلُكَ الْعَافِيَةَ
O Allah, You are the One who has created my soul and You are the One who will give it death.…
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