The Book of Purification and its Sunnah
1/98. Chapter:
The sexually impure person sleeping as he is without touching water
Sunan Ibn Majah
حَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ، عَنِ الأَعْمَشِ، عَنْ أَبِي إِسْحَاقَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يُجْنِبُ ثُمَّ يَنَامُ وَلاَ يَمَسُّ مَاءً حَتَّى يَقُومَ بَعْدَ ذَلِكَ فَيَغْتَسِلَ .
It was narrated that 'Aishah said: "The Messenger of Allah would become sexually impure and then sleep without water until he got up later on and taken a bath."
Reference : Sunan Ibn Majah 581In-book reference : Book 1, Hadith 315English translation : Vol. 1, Book 1, Hadith 581