Ya'la ibn Mumallak said that he asked Umm Salamah about the recitation and prayer of the Messenger of Allah ﷺ. She said: What have you to do with his prayer? He would pray, then sleep as long as he had prayed, till morning. She then described his recitation and did so with an exposition word by word. (Using translation from Abū Dāʾūd 1466)
أَنَّهُ سَأَلَ أُمَّ سَلَمَةَ عَنْ قِرَاءَةِ رَسُولِ اللهِ ﷺ وَصَلَاتِهِ بِاللَّيْلِ فَقَالَتْ وَمَا لَكُمْ وَصَلَاتُهُ كَانَ يُصَلِّي ثُمَّ يَنَامُ قَدْرَ مَا صَلَّى ثُمَّ يُصَلِّي قَدْرَ مَا نَامَ ثُمَّ يَنَامُ قَدْرَ مَا صَلَّى حَتَّى يُصْبِحَ وَنَعَتَتْ لَهُ قِرَاءَتَهُ فَإِذَا هِيَ تَنْعَتُ قِرَاءَةً مُفَسَّرَةً حَرْفًا حَرْفًا