he saw the Prophet sleeping, while in the prostration position, until he snored or snorted. Then he stoodup to pray. So I said: "O Messenger of Allah! You were sleeping?" He said: "Wudu is not required except for sleeping while reclining. For when one reclines, joints relax."  

أَنَّهُ رَأَى النَّبِيَّ ﷺ نَامَ وَهُوَ سَاجِدٌ حَتَّى غَطَّ أَوْ نَفَخَ ثُمَّ قَامَ يُصَلِّي فَقُلْتُ يَا رَسُولَ اللَّهِ إِنَّكَ قَدْ نِمْتَ قَالَ إِنَّ الْوُضُوءَ لاَ يَجِبُ إِلاَّ عَلَى مَنْ نَامَ مُضْطَجِعًا فَإِنَّهُ إِذَا اضْطَجَعَ اسْتَرْخَتْ مَفَاصِلُهُ  

[Machine] The Prophet ﷺ said, "There is no obligation for the one who falls asleep while in a state of ritual purity (wudu) to redo wudu until they lie down, because when they lie down, their joints relax."  

أَنَّ النَّبِيَّ ﷺ قَالَ لَيْسَ عَلَى مَنْ نَامَ سَاجِدًا وُضُوءٌ حَتَّى يَضْطَجِعَ فَإِنَّهُ إِذَا اضْطَجَعَ اسْتَرْخَتْ مَفَاصِلُهُ  

"لَيسَ عَلَى مَنْ نَامَ سَاجِدًا وُضُوءٌ، حَتَّى يَضَّطجعَ؛ فَإِنَّهُ إِذَا اضطجَعَ اسْتَرْخَتْ مَفاصِلهُ".  

"إِنَّمَا الوُضُوءُ عَلَى مَنْ نَامَ مُضْطَجِعًا؛ فَإِنَّه إِذَا اضْطَجَعَ اسْتَرْخَتْ مَفَاصِلُه ".