Sahih al-Bukhari 287
صحيح البخاري#287SahihNarrated `Umar bin Al-Khattab:I asked Allah's Messenger (ﷺ) "Can any one of us sleep while he is Junub?" He replied, "Yes, if he performs ablution, he can sleep while he is Junub
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:39