(13) باب ذِكْرِ صَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم بِاللَّيْلِ
It was narrated from Ya'la bin Mamlak that he asked Umm Salamah, the wife of the Prophet (ﷺ) about the recitation and prayer of the Messenger of Allah (ﷺ). She said:
"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.
Reference: Sunan an-Nasa'i 1629
In-book reference: Book 20, Hadith 32
English translation: Vol. 2, Book 20, Hadith 1630