When you go to bed during night, you should say:" O Allah, I surrender myself to Thee and entrust my affair to Thee, with hope in Thee and fear of Thee. There is no resort and no deliverer (from hardship but Thou). I affirm my faith in the Book which Thou revealed and in the Messengers whom Thou sent." If you die in this state you would die on Fitra, and Ibn Bashshdr did not make a mention of" night" in this hadith.  

أَنَّ رَسُولَ اللَّهِ ﷺ أَمَرَ رَجُلاً إِذَا أَخَذَ مَضْجَعَهُ مِنَ اللَّيْلِ أَنْ يَقُولَ اللَّهُمَّ أَسْلَمْتُ نَفْسِي إِلَيْكَ وَوَجَّهْتُ وَجْهِي إِلَيْكَ وَأَلْجَأْتُ ظَهْرِي إِلَيْكَ وَفَوَّضْتُ أَمْرِي إِلَيْكَ رَغْبَةً وَرَهْبَةً إِلَيْكَ لاَ مَلْجَأَ وَلاَ مَنْجَا مِنْكَ إِلاَّ إِلَيْكَ آمَنْتُ بِكِتَابِكَ الَّذِي أَنْزَلْتَ وَبِرَسُولِكَ الَّذِي أَرْسَلْتَ فَإِنْ مَاتَ مَاتَ عَلَى الْفِطْرَةِ وَلَمْ يَذْكُرِ ابْنُ بَشَّارٍ فِي حَدِيثِهِ مِنَ اللَّيْلِ  

The Prophet said: “When one of you lies down on his right side, then says: ‘O Allah, I have submitted myself to You, and I have turned my face to You, and I lay myself down relying upon You, and I have entrusted my affair to You, there is no refuge [nor escape] from You except to You. I believe in Your Book and Your Messengers (Allāhumma innī aslamtu nafsī ilaika wa wajjahtu wajhī ilaika, wa alja’tu ẓahrī ilaika, wa fawwaḍtu amrī ilaika, lā malja'a [wa lā manjā] minka illā ilaik, ūminu bikitābika wa birusulika)’ – then if he dies that night, he shall enter Paradise.”  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا اضْطَجَعَ أَحَدُكُمْ عَلَى جَنْبِهِ الأَيْمَنِ ثُمَّ قَالَ اللَّهُمَّ إِنِّي أَسْلَمْتُ نَفْسِي إِلَيْكَ وَوَجَّهْتُ وَجْهِي إِلَيْكَ وَأَلْجَأْتُ ظَهْرِي إِلَيْكَ وَفَوَّضْتُ أَمْرِي إِلَيْكَ لاَ مَلْجَأَ وَلاَ مَنْجَا مِنْكَ إِلاَّ إِلَيْكَ أُومِنُ بِكِتَابِكَ وَبِرُسُلِكَ فَإِنْ مَاتَ مِنْ لَيْلَتِهِ دَخَلَ الْجَنَّةَ  

The Prophet said: “When one of you lies down on his right side, then says: ‘O Allah, I have submitted myself to You, and I have turned my face to You, and I lay myself down relying upon You, and I have entrusted my affair to You, there is no refuge [nor escape] from You except to You. I believe in Your Book and Your Messengers (Allāhumma innī aslamtu nafsī ilaika wa wajjahtu wajhī ilaika, wa alja’tu ẓahrī ilaika, wa fawwaḍtu amrī ilaika, lā malja'a [wa lā manjā] minka illā ilaik, ūminu bikitābika wa birusulika)’ – then if he dies that night, he shall enter Paradise.” (Using translation from Tirmidhī 3395)  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا اضْطَجَعَ أَحَدُكُمْ عَلَى جَنْبِهِ الْأَيْمَنِ ثُمَّ قَالَ اللهُمَّ أَسْلَمْتُ نَفْسِي إِلَيْكَ وَأَلْجَأْتُ ظَهْرِي إِلَيْكَ وَفَوَّضْتُ أَمْرِي إِلَيْكَ لَا مَنْجَا مِنْكَ إِلَّا إِلَيْكَ وَأُومِنُ رَبَّنَا بِكَ وَبِرُسُلِكَ فَإِنْ مَاتَ مِنْ لَيْلَتِهِ دَخَلَ الْجَنَّةَ  

The Prophet said: “When one of you lies down on his right side, then says: ‘O Allah, I have submitted myself to You, and I have turned my face to You, and I lay myself down relying upon You, and I have entrusted my affair to You, there is no refuge [nor escape] from You except to You. I believe in Your Book and Your Messengers (Allāhumma innī aslamtu nafsī ilaika wa wajjahtu wajhī ilaika, wa alja’tu ẓahrī ilaika, wa fawwaḍtu amrī ilaika, lā malja'a [wa lā manjā] minka illā ilaik, ūminu bikitābika wa birusulika)’ – then if he dies that night, he shall enter Paradise.” (Using translation from Tirmidhī 3395)   

"إِذَا اضْطَّجَعَ أحدُكم على جنْبهِ الأيمنِ، ثمَّ قال: اللَّهُمَّ إني أسلمتُ نفسِى إليكَ ووجّهتُ وجْهى إليكَ، وألجأتُ ظهْرِى إليكَ وفوَّضتُ أمْرى إليك، لا ملجأ مِنْك إلا إليكَ أوْمِنُ بكتابِكَ وبرسولِكَ، فإنْ مات منْ ليلتِه دخل الجنةَ".