´It was narrated that 'Aishah said:` "The Messenger of Allah, if he needed any of his wives, would satisfy his needs then he would sleep as he was, without touching water."
Hadith Referenceسنن ابن ماجه / أبواب التيمم / 582
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:ضعيف, ضعيف, انظر الحديث السابق (581), انوار الصحيفه، صفحه نمبر 399
1؎: If a person in a state of major ritual impurity (junub) intends to sleep without performing the ritual bath (ghusl), it is recommended (mustahabb) that he perform ablution (wudu). However, if he does not do so, it is still permissible, as mentioned in this hadith and the previous hadith.