Narrated Ya'la bin Mamlak: that he asked Umm Salamah, the wife of the Prophet (ﷺ), about the recitation of the Prophet (ﷺ) and his Salat. She said: "What can you do compared to his Salat? He would pray and then sleep as long as he had prayed. Then he would pray as long as he had slept. Then he slept as long as he had prayed until the morning.' Then she described his recitation. So she described his recitation as word by word."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ عَبْدِ اللَّهِ بْنِ عُبَيْدِ اللَّهِ بْنِ أَبِي مُلَيْكَةَ، عَنْ يَعْلَى بْنِ مَمْلَكٍ، أَنَّهُ سَأَلَ أُمَّ سَلَمَةَ زَوْجَ النَّبِيِّ صلى الله عليه وسلم عَنْ قِرَاءَةِ النَّبِيِّ صلى الله عليه وسلم وَصَلاَتِهِ فَقَالَتْ مَا لَكُمْ وَصَلاَتَهُ كَانَ يُصَلِّي ثُمَّ يَنَامُ قَدْرَ مَا صَلَّى ثُمَّ يُصَلِّي قَدْرَ مَا نَامَ ثُمَّ يَنَامُ قَدْرَ مَا صَلَّى حَتَّى يُصْبِحَ ثُمَّ نَعَتَتْ قِرَاءَتَهُ فَإِذَا هِيَ تَنْعَتُ قِرَاءَةً مُفَسَّرَةً حَرْفًا حَرْفًا . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ لاَ نَعْرِفُهُ إِلاَّ مِنْ حَدِيثِ لَيْثِ بْنِ سَعْدٍ عَنِ ابْنِ أَبِي مُلَيْكَةَ عَنْ يَعْلَى بْنِ مَمْلَكٍ عَنْ أُمِّ سَلَمَةَ . وَقَدْ رَوَى ابْنُ جُرَيْجٍ هَذَا الْحَدِيثَ عَنِ ابْنِ أَبِي مُلَيْكَةَ عَنْ أُمِّ سَلَمَةَ أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يُقَطِّعُ قِرَاءَتَهُ . وَحَدِيثُ لَيْثِ أَصَحُّ .
sunnah.com