A bedtime supplication for which Allah forgives the sins
ذِكْرُ الشَّيْءِ الَّذِي يَغْفِرُ اللَّهُ ذُنُوبَ قَائِلِهِ إِذَا أَوَى إِلَى فِرَاشِهِ
from the Prophet ﷺ : "Whoever says when he retires to his bed, 'There is no God but Allah alone without any partners, to Him belong the dominion and praise and He is powerful over all things, there is no movement or might but in Allah, glory be to Allah and all praise is due to Allah, there is not God but Allah, and Allah is the greatest, then Allah will forgive his sins even if they were like the foam of the sea."
عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ قَالَ حِينَ يَأْوِي إِلَى فِرَاشِهِ لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللَّهِ سُبْحَانَ اللَّهِ وَالْحَمْدُ لِلَّهِ وَلَا إِلَهَ إِلَّا اللَّهُ وَاللَّهُ أَكْبَرُ غَفَرَ اللَّهُ ذُنُوبَهُ أَوْ خَطَايَاهُ شَكَّ مِسْعَرٌ وَإِنْ كَانَ مِثْلَ زَبَدِ الْبَحْرِ»