Mishkat al-Masabih
Mishkat al-Masabih 468
Associating with one who is defiled, and what is permitted - Section 3
Arabic hadith text
عَنْ أُمِّ سَلَمَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُجْنِبُ ثُمَّ يَنَامُ ثُمَّ يَنْتَبِهُ ثُمَّ يَنَامُ. رَوَاهُ أَحْمد
Translation
Umm Salama said that God’s messenger would become defiled, then go to sleep, then awake, then go to sleep again. Ahmad transmitted it.