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."
Sahih al-Bukhari Book 5, Hadith 39
← Previous Hadith I asked `Aisha "Did the Prophet (ﷺ) use to sleep while he was Junub?" She replied, "Yes, but he used to perform ablution (before going to bed).

Sahih al-Bukhari Book 5, Hadith 38 Next Hadith → Whenever the Prophet (ﷺ) intended to sleep while he was Junub, he used to wash his private parts and perform ablution like that for the prayer.

Sahih al-Bukhari Book 5, Hadith 40