Not graded
Bulugh al-Maram 82
وَلِأَبِي دَاوُدَ أَيْضًا, عَنْ اِبْنِ عَبَّاسٍ مَرْفُوعًا: { إِنَّمَا اَلْوُضُوءُ عَلَى مَنْ نَامَ مُضْطَجِعًا } وَفِي إِسْنَادِهِ ضَعْفٌ أَيْضً ا 1 .
1 - منكر. رواه أبو داود (202).
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].
Cited in Bulugh al-Maram (No. 82).