Sunan an-Nasa'i 258
سنن النسائي#258SahihIt 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 1:259