´It was narrated that 'Aishah said:` "If the Messenger of Allah (ﷺ) wanted to sleep while he was Junub, he would perform Wudu' as for prayer before sleeping."
Hadith ReferenceSunan an-Nasa'i / Mention When Ghusal (A Purifying Bath) Is Obligatory And When It Is Not / Hadith: 259
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم