Yahya related to me from Malik from Hisham ibn Urwa from his father that A'isha, the wife of the Prophet ﷺ used to say, "If you have intercourse with your wife and then wish to go to sleep before doing ghusl, do not sleep until you have done wudu as for prayer."  

عَنْ عَائِشَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّهَا كَانَتْ تَقُولُ إِذَا أَصَابَ أَحَدُكُمُ الْمَرْأَةَ ثُمَّ أَرَادَ أَنْ يَنَامَ قَبْلَ أَنْ يَغْتَسِلَ فَلاَ يَنَمْ حَتَّى يَتَوَضَّأَ وُضُوءَهُ لِلصَّلاَةِ  

Yahya related to me from Malik from Nafi that Abdullah ibn Umar, if he wished to sleep or eat while junub, would wash his face, and his arms to the elbows, and wipe his head. Then he would eat or sleep. 2.20 The Repetition of the Prayer by a Person in a State of Major Ritual Impurity, his Doing Ghusl, when He has Prayed without Remembering it, and his Washing his Garments.  

أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ إِذَا أَرَادَ أَنْ يَنَامَ أَوْ يَطْعَمَ وَهُوَ جُنُبٌ غَسَلَ وَجْهَهُ وَيَدَيْهِ إِلَى الْمِرْفَقَيْنِ وَمَسَحَ بِرَأْسِهِ ثُمَّ طَعِمَ أَوْ نَامَ