"What do you want to know about his prayer (I.e., you can never match it)? He used to pray, then sleep for as long as he had prayed, then he would pray as long as he had slept, then he would sleep as long as he had prayed, until dawn came." Then she described to him his recitation, and she described a clear recitation in which every letter was distinct. (Using translation from Nasāʾī 1629)
أَنَّهُ سَأَلَ أُمَّ سَلَمَةَ زَوْجَ النَّبِيِّ ﷺ عَنْ قِرَاءَةِ رَسُولِ اللهِ ﷺ وَصَلَاتِهِ قَالَتْ «مَا لَكُمْ وَصَلَاتِهِ كَانَ يُصَلِّي ثُمَّ يَنَامُ قَدْرَ مَا صَلَّى ثُمَّ يُصَلِّي قَدْرَ مَا نَامَ ثُمَّ يَنَامُ بِقَدْرِ مَا صَلَّى حَتَّى يُصْبِحَ ثُمَّ نَعَتَتْ لَهُ قِرَاءَتَهُ فَإِذَا هِيَ تَنْعَتُ قِرَاءَةً مُفَسَّرَةً حَرْفًا حَرْفًا» قَالَ أَبُو عَبْدِ الرَّحْمَنِ يَعْلَى بْنُ مَمْلَكٍ لَيْسَ بِذَاكَ الْمَشْهُورِ