1
Bulugh al-Maramوَلِأَبِي دَاوُدَ أَيْضًا, عَنْ اِبْنِ عَبَّاسٍ مَرْفُوعًا: { إِنَّمَا اَلْوُضُوءُ عَلَى مَنْ نَامَ مُضْطَجِعًا } وَفِي إِسْنَادِهِ ضَعْفٌ أَيْضً ا (99) .
And Ibn "Abbas (rad) narrated in a Marfu' (traceable) Hadith that:
"Ablution is necessary for one who sleeps while he is lying flat. [Reported by Abu Da'ud and there is weakness in its chain of narrators].
Reference: Bulugh al-Maram 82
In-book : Book 1, Hadith 99
English translation : Book 1, Hadith 88
In-book : Book 1, Hadith 99
English translation : Book 1, Hadith 88