ذِكْرُ الْوَقْتِ الَّذِي كَانَ يَقُومُ فِيهِ الْمُصْطَفَى ﷺ لِلتَّهَجُّدِ
"I came to Al-Aswad bin Yazid, who was a close friend of mine and said: 'O Abu 'Amr, tell me what the Mother of the Believers told you about the prayer of the Messenger of Allah ﷺ.' He said: 'She said: "He used to sleep for the first part of the night and stay up for the latter part.'" (Using translation from Nasāʾī 1640)
عَنْ صَلَاةِ رَسُولِ اللَّهِ ﷺ بِاللَّيْلِ فَقَالَتْ «كَانَ يَنَامُ أَوَّلَ اللَّيْلِ وَيَقُومُ آخِرَهُ»