[Machine] Umar, may Allah be pleased with him, asked the Messenger of Allah, peace be upon him, and said, "Can I experience sexual impurity (Janaba) during the night?" So he instructed him to "wash his private parts, perform ablution, and then go to sleep."  

سَأَلَ عُمَرُ رِضْوَانُ اللَّهِ عَلَيْهِ رَسُولَ اللَّهِ ﷺ فَقَالَ تُصِيبُنِي الْجَنَابَةُ مِنَ اللَّيْلِ؟ فَأَمَرَهُ أَنْ «يَغْسِلَ ذَكَرَهُ وَيَتَوَضَّأَ ثُمَّ يَرْقُدَ»  

[Machine] I asked Aisha, "How did the Messenger of Allah ﷺ act when he wanted to sleep while in a state of sexual impurity?" She said, "He would perform ablution as he does for prayer, then he would sleep."  

سَأَلْتُ عَائِشَةَ كَيْفَ كَانَ رَسُولُ اللَّهِ ﷺ يَصْنَعُ إِذَا أَرَادَ أَنْ يَنَامَ وَهُوَ جُنُبٌ؟ فَقَالَتْ كَانَ «يَتَوَضَّأُ وُضُوءَهُ لِلصَّلَاةِ ثُمَّ يَنَامُ»