I asked the Messenger of Allah ﷺ : O Messenger of Allah ﷺ, if one of us wants to sleep before doing ghusl when he is junub, what should he do? He said: ʿLet him do wudoo’ as for prayer, then sleep.”
سَأَلْتُ رَسُولَ اللهِ ﷺ قُلْتُ يَا رَسُولَ اللهِ أَحَدُنَا إِذَا أَرَادَ أَنْ يَنَامَ وَهُوَ جُنُبٌ كَيْفَ يَصْنَعُ قَبْلَ أَنْ يَغْتَسِلَ؟ قَالَ يَتَوَضَّأُ وُضُوءَهُ لِلصَّلاةِ ثُمَّ يَنَامُ