Bathing (Ghusl)
5/27. Chapter:
A Junub person should perform ablution before sleeping
Sahih Bukhari
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ حَدَّثَنَا جُوَيْرِيَةُ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ، قَالَ اسْتَفْتَى عُمَرُ النَّبِيَّ صلى الله عليه وسلم أَيَنَامُ أَحَدُنَا وَهْوَ جُنُبٌ قَالَ " نَعَمْ، إِذَا تَوَضَّأَ ".
Narrated `Abdullah: `Umar asked the Prophet (ﷺ) "Can anyone of us sleep while he is Junub?" He replied, "Yes, if he performs ablution."
Reference : Sahih al-Bukhari 289In-book reference : Book 5, Hadith 41USC-MSA web (English) reference : Vol. 1, Book 5, Hadith 287